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Roadmaster High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 10K GTW, 400 lbs TW

Roadmaster High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 10K GTW, 400 lbs TW

Item # RM-048-4
Our Price: $197.71
Accessories and Parts
Shipping Weight: 20 lbs
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Make up for the height difference between your RV and towed vehicle with this hitch adapter. Provides either a 4" drop or a 4" rise. Solid shank provides strength and durability. 1-800-940-8924 to order Roadmaster accessories and parts part number RM-048-4 or order online at Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 10K GTW, 400 lbs TW. Accessories and Parts reviews from real customers.
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  • Reviews (140)
  • Q & A (0)
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Roadmaster Accessories and Parts - RM-048-4

  • Tow Bar
  • Hitch Adapters
  • High-Low Adapter
  • Roadmaster
  • 4 Inch Rise/Drop
  • Fits 2 Inch Hitch

Make up for the height difference between your RV and towed vehicle with this hitch adapter. Provides either a 4" drop or a 4" rise. Solid shank provides strength and durability.


  • Allows for proper positioning of tow bar
    • Makes up for height difference between RV's hitch and towed vehicle's base plates
    • Also lets you mount a bike rack, cargo carrier, or other 2" hitch accessory
  • Provides either drop or rise for adequate ground clearance
  • Constructed of sturdy steel
    • Solid shank for suprerior strength and durability
  • Resists rust and corrosion with black powder coat finish
  • Hitch pin and clip or hitch lock sold separately
  • Made in the USA


  • Application: 2" x 2" trailer hitch receivers
  • Drop/rise: 4"
  • Receiver: 2" x 2"
  • Tongue weight: 400 lbs
  • Gross towing weight: 10,000 lbs
  • Length: 14-5/8" overall
    • 9-5/8" From center of hitch pin hole to center of hitch pin hole
    • 4-1/2" From center of hitch pin hole to angled bracket
  • Limited Lifetime Warranty

Note: This adapter is designed to flat tow a vehicle only. Do not use to tow a trailer. When using with a hitch-mounted accessory, such as a bike rack or cargo carrier, the tongue weight of your hitch will be reduced by at least 50 percent.

Most tow systems require some sort of hitch accessory to either raise or lower the tow bar to an appropriate level. The "Safe Zone" for a motor-home-mounted tow bar ranges from 3" above level to 3" below. Car-mounted models must be absolutely level. This high-low adapter can provide you with the necessary drop or desired rise to achieve a level tow bar setup.

048-4 Road Master Hi-Low Hitch Adapter - 4" - 10,000 lbs GTW; 400 lbs TW

Installation Details RM-048-4 Installation instructions

Customer Satisfaction Score:

Customer Reviews

Roadmaster High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 10K GTW, 400 lbs TW - RM-048-4

Average Customer Rating:  4.9 out of 5 stars   (140 Customer Reviews)

Make up for the height difference between your RV and towed vehicle with this hitch adapter. Provides either a 4" drop or a 4" rise. Solid shank provides strength and durability.


Towing an F150 behind my RV. Good tight stable sway free fit with thin 1mm shims.


No matter we order from your company all of you are always on time and the price is right. We have enjoyed doing business with you.

Keep up the good work!


Great product for price. The u bolt system seems to b perfect as it took all slack out of receiver and drop hitch. The staff at e trailer go beyond expectations for customer service and provides excellent information on needed products. My complete tow pkg came from etrailer. I have bought from them in past and probably won't waste my time shopping for better price as these people are the "bomb". Hope this product works well as I just intstalled and will report after next trip. Luv etrailer. (:


The hitch adapter was exactly as described and is going to work perfectly. Ordering on the website was easy and shipping was as promised. I didn't really consider the extension aspect, but that will also work well for me. I know I don't have my safety cables hooked up correctly in the photo (they should cross under the hitch) but I was just trying it on for size.


eTrailer is the only place I go for accessories and parts! The best prices, easy to order, and shipping is fast!


Definitely good quality products and superfast deliveries. This is one company that really cares about the customers. I would recommend etrailer to everyone. I've got my 2017 Tacoma all ready to plow thanks to etrailer.
Thank You to all the people who work for etrailer...... Great job!


Everything installed without any issues. I'm very particular so it took 2 days to complete everything. I'm sure a pro could do it much faster. Have towed the 4" lifted (and loaded) Jeep accross the Rockies about 6 times and everything is working perfectly!! Very happy camper!!


Arrived in good shape well packaged it is a solid and well constructed


Always a pleasure dealing with etrailer. Great customer service.


Ms Paula and crew always take care of our orders. She also follows up to make sure we get what we need. Great customer service.


This hitch adapter worked as intended aligning the tow bar with the rv hitch! Etrailer is the best!


that hole in the solid bar is too far to the back by 4-6". i'm going to a metal fabricator tomorrow to see if he can drill it where it should be. as is, the receiver opening will be extended way to far out from the truck hitch.

Etrailer Expert

Heather A.


Tommy, Thank you for your review. We do have high low adapters that measure shorter center of hitch pin hole to center of hitch pin hole. The high low adapter you purchased part RM-048-4 measures 9-5/8. I am assuming you need a 4 inch rise to be level. Part # RM-048-4 by Roadmaster is 6-1/2 pin hole to pin hole. This part allows for up to 500 lbs in tongue weight. I have looked at the other options and this is the shortest measurement on a high low adapter with the rise and capacity you need. We do not recommend drilling a hole in the part because it can negatively affect the structural integrity of the part, causing safety issues in the future. I have attached a link for the Roadmaster part below.



I took your advice and didnt drill the hitch, so nothing has changed in my review.


I am sorry to have to give this low rating, but the only way the holes line up if the receiver hitch adapter is in the Rise position. We need it in the Drop position. I’ll call you tomorrow.


I had bent one leg of the towbar. I called Roadmaster to understand why for a second time. They explained that I was out of tolerance level. I was about to order when they reflected that etrailer would sell it cheaper and get it to me faster. Etrailer knew exactly what I wanted and did sell it less expensive and got it to me within a couple of days. They also had the correct hitch extension and height adjustment that I needed to correct the root cause. 20000 miles and no reoccurance. No impact to my Motor Home trip.


Got it really fast, and the salesman was a great help!


Very heavy solid steel adapter with 10,000 pound rating. Allows me to tow my Silverado 2500 behind my RV with the tow bar levil


Excellent customer service, even when the customer makes dumb mistakes like I did.
Great quality products as well.
There are 150 people living at my shipping address, it would have been helpful if my name were on the package instead of my phone number.


Needed a 4” riser to get my motorcycle carrier to have some ground clearance on our motor home. This worked perfect for my needs


The product arrived two days after I ordered it. I ordered an additional hitch pin and an anti-rattle clamp to go with it, and they were both there too. Everything fit, and worked just as advertised. No real surprises there, but always good when even simple things work out as they should. My main reason for writing a review is to draw attention to the number of folks that I see cruising the highways without a hitch drop like this to align their tow bar setup properly. This part wasn't expensive or difficult to find or install. Kudos to etrailer for making it easy.


I have been setting up my 2017 Fiat for towing with my mhome. All parts were on time and worked perfectly. Greg & Reesa was very helpful and knew exactly what I would need to get the job done. Etrailer has my business from now on . The patriot 2 brake system works excellent and that was my biggest concern. Glad I called on etrailer and will again in the future, they have it going on!


Fast shipping and exactly what I needed for towing F-150 with Etrailer recommendeded Roadmaster Blackhawk2 towing setup. Feel much better with Roadmaster 10k rating (matching the towbar) rather than lower rated locally available adapters.


Well made, a little longer than the Blue Ox 4" rise / drop. Just what I needed to clear my Motorhome bumper and line up my tow bar to use with a lifted Jeep. Thanks


Although I haven't used yet, (will in 2 wks), the hitch extension appears to be well made.
etrailer provided superb service and this heavy product arrived in good shape, no damage to the carton or the hitch.


I needed a 4" rise to get a level tow with my Blue Ox tow bars.
This works perfectly.


Ordered the 4 inch drop receiver and was given express shipping FREE. Thanks etrailer. Have not installed yet. Looks to be good quality. Can't wait to use it.

Show More Reviews

See what our Experts say about this Roadmaster Accessories and Parts

  • Recommendation to Lower Hitch Cargo Carrier on 2017 Jeep Wrangler Unlimited
    I have a solution for you. To lower your hitch-mount cargo carrier on your 2017 Jeep Wrangler Unlimited, I recommend using either the Roadmaster High-Low Adapter # RM-048-6 with a 6 inch drop or # RM-048-4 with a 4 inch drop, depending on how much of a drop you are needing to clear the spare tire. You will also want to make sure you do not run into any ground clearance issues with lowering the carrier. As you mentioned in your question, the use of this or any similar hitch adapter is...
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  • Will the Roadmaster 4" High-Low Adapter for Tow Bars Work in Drop Position
    The Roadmaster High-Low Adapter for Tow Bars part # RM-048-4 can be used in either the rise or drop position, the pin alignment would be the same either way. If used in the rise position, it will provide a 4" rise or if used in the drop position, it will provide a 4" drop. I did see 1 review out of 124 which stated it would not work in the drop position but it's hard telling what they were doing so it should not concern you as the adapter is designed to work either way and we've used...
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  • Can the Roadmaster High-Low Adapter Part # RM-048-4 be Used with a Motorcycle Carrier
    The best option we have for you is the Roadmaster High-Low Adapter part # RM-048-4 which is designed for flat-towing but can be used for hitch-mounted accessories like your motorcycle carrier. However, as you mentioned you will sacrifice some of the tongue weight capacity when using this or any adapter for that matter. The Roadmaster High-Low Adapter has a weight capacity of 400 lbs but it also reduces the tongue weight capacity of the trailer hitch by 50%. If the tongue weight capacity...
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  • Availability of 10k 4 inch Rise/Drop High Low Adapter for 2017 Thor Hurricane 31s
    Sounds like you are looking for the part # RM-048-4. This is a Roadmaster High Low adapter with a 10k capacity that has 4 inch rise/drop. The fit of this is RV specific so that's why it's not listed as a fit for your 2017 Thor Hurricane. It will fit and work well though.
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  • Solution for Transporting Power Wheel Chair with 2014 Ford Explorer
    Using any type of hitch adapter is going to reduce the tongue weight capacity of the trailer hitch by 50%. This means that if the trailer hitch on your 2014 Ford Explorer has a tongue weight capacity of 500 pounds, this will be reduced to 250 pounds when using the adapter. You mentioned in your question that you have a Class II trailer hitch on your Ford Explorer. I recommend verifying this as typically this vehicle will have a Class III receiver installed. A Class II trailer hitch is...
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  • Recommendation for a High-Low Adapter with a Cargo Carrier
    The high/low adapter you would need would be Roadmaster # RM-048-4, but it's important to keep in mind that using this adapter with a cargo carrier will reduce your tongue weight by 50 percent. If the 400lbs. max weight is the tongue weight of the trailer hitch then it would be reduced to 200lbs. and if you plan to carry 400 lbs. you will need to be sure that your hitch has an 800 lb tongue weight capacity. You would just want to make sure your cargo carrier doesn't exceed this weight...
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  • How to Choose the Correct High-Low Adapter for Flat Towing
    It sounds to me like you are referring to a high-low adapter. A high-low adapter will attach to the RV's trailer hitch receiver and lower/raise the height at which the tow bar connects to the RV. Generally speaking, in order to find the correct high-low adapter you will first need to measure from the ground up to the center of the trailer hitch receiver opening and then from the ground up to the center of the base plate kit. The difference between these measurements will give you the correct...
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  • High Low Hitch Adapter Recommendation for 2018 Toyota Sienna
    We have the Roadmaster High-Low Adapter # RM-048-4 that should work for your application but you'll want to measure first. If you measure from the center of your hitch pin hole out to the furthest point out on the rear bumper and it's less than 9-5/8 inches The # RM-048-4 will fit and clear the bumper. Just looking at your picture I can't see how this wouldn't work but it never hurts to measure to be sure.
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    Image 1 for
  • Finding the Correct Ball Mount to Tow a 64 Mallard Camper Trailer Level with 2004 Chevy Trailblazer
    It sounds like you just need a properly sized ball mount to tow the camper with your 2004 Chevy Trailblazer. Another possible option is to use an adjustable tow bar. That way you can adjust one ball mount for use on 2 vehicles. I have included a link to the adjustable ball mounts we carry and a link to an FAQ article that explains how to measure for the correct rise or drop needed to tow a trailer level. The Roadmaster High-Low Hitch Adapter, # RM-048-4, is for tow bar use only (when...
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  • Solution for Needing Base Plate Kit at a Higher Level for Tow Bar to Be Level
    I wish we had that ability to do that with the removable arms from Roadmaster but they don't have rise arm setups. I believe what you'd really want is a high-low adapter to allow your tow bar to level when you are flat towing. The closest to 5 inches that we have is the 4 inch adapter # RM-048-4 which would fit well.
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  • Recommended High-Low Adapter for Dropping Receiver 5 To Flat Tow a 2014 Chevrolet Sonic With RV
    If you are at around 5" difference I recommend the 4" Roadmaster High-Low Adapter # RM-048-4. This will allow you to stay in the 3" +/- range for the tow bars, without sacrificing any ground clearance. The High-Low Adapter # RM-048-6 would still work but will sit 2" lower to the ground which may become an issue over bumps and driveways. You might also consider the Roadmaster Dual Hitch Receiver Adapter # RM-077-4 if you would like to carry a bike rack or other hitch mounted accessory...
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  • Adapter to Lower Height of Hitch-Mounted Cargo Carrier
    A 2-inch high/low hitch adapter like Roadmaster # RM-048-6 will provide 6-inches of drop (or rise) to allow your 2-inch cargo carrier to be lower than hitch height. Part # RM-048-4 will give you 4-inches of drop (or rise). Do please note three important considerations when using either of these adapters. These have a 400-lb tongue weight rating, which means that no matter how much capacity your hitch may have, the combined weight of the cargo carrier and what you load onto it cannot exceed...
    view full answer...
  • Parts Needed For Scooter Trailer That Is Not Level When Towing Behind RV
    Part # RM-048-4 is not to be used with any kind of trailer; they are to be used with towbars to pull vehicles behind RVs. They are not built to support the tongue weight of a trailer. Even though the part states that it can hold up to 400 pounds tongue weight and your trailer is at 325 pounds it should not be used. When towing a trailer, when the trailer hits a bump and comes back down it will be exerting more than 325 pounds of downward force on the tongue. This does not happen with a...
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  • Recommended Rise/Drop Adapter for Flat Towing with Between 2-4" Rise
    I may have a solution for you, and it generally sounds like you're in need of a high/low adapter like the Roadmaster # RM-048-4, which has 4" rise and a 10000-lbs capacity that would work well for this application. However, you mentioned wanting to have a dual hitch to allow you to mount something below the top receiver and unfortunately using the top receiver for the tow bar is not going to allow the bottom receiver to be used. Using a dual hitch receiver requires you to use the bottom...
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  • Recommended Trailer Hitch Adapter To Raise Cargo Carrier For Ground Clearance
    We do have a hitch adapter that might work for you, but it does reduce the capacity of your trailer hitch by 50 percent when used. I recommend the Roadmaster High-Low Adapter, part # RM-076. This adapter has a 6 inch rise and is designed to work with 2 inch receivers. For an adapter with a 4 inch rise I recommend part # RM-048-4.
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  • Can A High-Low Adapter Be Used With The Roadmaster Spare Tire Carrier When Flat Towing?
    Yes, you can use a high/low adapter such as Roadmaster High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 10K GTW, 400 lbs TW # RM-048-4 in combination with the Roadmaster Spare Tire Carrier # RM-195125. Just keep in mind the spare tire carrier reduces your trailer hitch receiver's overall capacity by 33%. The high/low adapter will not reduce any capacity as long as you are only using it to flat tow. I attached a couple demonstration videos for you to check out.
    view full answer...
  • 4 inch High Low Adapter with More Length than # RM-048-4
    The part # RM-070 has a distance of 6 inches from the pin hole to the angled bracket and has the 4 inches of rise/drop you need so it would be a great solution.
    view full answer...
  • High Low Adapter for 5-1/2 inch Coach/Toad Height Difference
    A 4 inch high-low adapter would be correct for a tow bar/base plate height difference of 5-1/2 inches since you basically just have to get within 3 inches of level. So for that the Roadmaster part # RM-048-4 would work great as it is the correct rise/drop and has a 10,000 lb total weight capacity.
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  • Can I Use the Swagman Traveler XCS While Flat Towing
    Yes. You can use the Swagman Traveler XCS # S64664 on the shank of a high/low adapter or ball mount that you use to connect to your Blue Ox tow bar when flat towing. If you're not already using a high/low adapter, something like the Roadmaster # RM-048-4 would work well for this application since it's only got a 4" drop.
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  • How is Rise or Drop Measured for a High Low Adapter for Flat Towing a Vehicle Behind a Motor Home
    We measure rise or drop on high low adapters from the center of the shank that fits into the trailer hitch receiver opening up or down to the center of the receiver opening on the adapter. I have included a picture that shows this on 4 inch rise/drop adapter # RM-048-4.
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  • How to Select High/Low Hitch Adapter for Motorhome and Towed Vehicle to Keep Tow Bar Level
    The Blue Ox 2-Inch High-Low Adapter for Tow Bars # RM-048-4 has a 10,000-lb towing capacity in both 4-inch rise or 4-inch drop positions. If your towed car is now showing unusual tire wear when towed by your new motorhome you will want to make sure that when hitched at both ends your tow bar is close to perfectly level. If the tow bar were to be several inches lower at the motorhome end it could pull down on the front of the toad and cause more pressure and wear on the tires. Tow bars...
    view full answer...
  • Drop Shank Recommendation for Allowing Trailer with Weight Distribution System to Set Lower
    Sounds like you need a drop shank for your weight distribution system. We can help with that but the high low adapters like the part # RM-048-4 are not to be used with weight distribution systems. The part # C17123 works with most weight distribution systems that have shank holes that are 3/4 inched in diameter and has a maximum drop of 8-1/4 inches.
    view full answer...
  • Compatibility of High-Low Adapter with Hitch Mounted Motorcycle Carrier
    The Roadmaster High-Low Adapter for Tow Bars # RM-048-4 will allow you to use your carrier and give you the 4 inch drop. However, you will also reduce the tongue weight of your trailer hitch by 50%. So your hitch itself will need a tongue weight rating of 720 lbs or higher for this combination to work for you. The issue with using an adapter is that reduction in tongue weight capacity because of the extra torque that is added to the hitch receiver. Due to the weight of a motorcycle,...
    view full answer...
  • High Low Adapter Recommendation for Flat Towing So that Swagman XCS Traveller Bike Rack Can be Used
    The Swagman XCS Bike Rack part # S64664 that you referenced would attach to the shank of the Roadmaster High-Low Adapter for Tow Bars # RM-048-4 and you'd be set. This would be a great setup that would work well.
    view full answer...

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