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Roadmaster Guardian Rock Guard

Roadmaster Guardian Rock Guard

Item # RM-4000
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RM-4000 - Guardian Roadmaster Accessories and Parts
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Protect your towed vehicle's finish and resale value with this car shield crafted from hollow rotationally molded high-impact polyethylene. Center panel easily attaches to the tow bar mounting bracket. Connecting rods attach to two side panels. 1-800-940-8924 to order Roadmaster accessories and parts part number RM-4000 or order online at Free expert support on all Roadmaster products. Guaranteed Lowest Price and Fastest Shipping for Roadmaster Guardian Rock Guard. Accessories and Parts reviews from real customers.
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  • Reviews (39)
  • Q & A (0)
  • Videos (3)
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  • Why etrailer?

Roadmaster Accessories and Parts - RM-4000

  • Tow Bar
  • Vehicle Guards
  • Rock Guard
  • Roadmaster
  • Guardian

Protect your towed vehicle's finish and resale value with this car shield crafted from hollow rotationally molded high-impact polyethylene. Center panel easily attaches to the tow bar mounting bracket. Connecting rods attach to two side panels.


  • Car shield protects towed vehicle from road debris
  • Removes in seconds
  • 26" Tall x 71" wide
  • Fits all Roadmaster tow bars with quick disconnects (RM-201 - sold separately)
    • Not compatible with EZ5, MS, or MX baseplates
  • If more than one car is towed, a second vehicle kit (RM-4000-1 - sold separately) contains all the mounting hardware necessary to swap the Roadmaster Guardian from one vehicle to another
  • Limited Lifetime Warranty

Close Up of Attachment

Installation Steps

4000 Roadmaster Guardian Rock Guard

Installation Details RM-4000 Installation instructions

Video of Roadmaster Guardian Rock Guard

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Roadmaster Guardian Rock Guard Review

Speaker 1: Today we're going to be taking a look at the Roadmaster Guardian Rock Guard, part number RM-4000. When we go to flat tow a vehicle, we have a lot of issues with road debris flying up and hitting the front of our vehicle. Whether it be rocks or gravel or anything else, we don't want the paint to be scratched, let alone a headlight broken. Our Guardian's going to protect the front of our vehicle and make sure the paint stays in nice condition, as well as the headlights. Our Guardian's going to be made out of a molded polyethylene material with a hollow core, so it's going to be extremely durable but also very lightweight.Now our Guardian is going to be compatible with all Roadmaster base plates that have the quick disconnect style crossbar, which is sold separately. This center section of our Guardian is going to be attached directly to the base plate on a bracket, and the two side panels are going to have a connecting rod that's going to connect those to the center.

Now, because of its design, we're going to be able to remove in a manner of seconds and actually fold the sides in for a smaller footprint so we can store it.One of the nice things about our Guardian is that it does remove extremely easily and is easy to store. We can simply just pull those pins out, loosen up those thumb screws and we can pull the whole assembly off and set it aside. And that will finish up your look at the Roadmaster Guardian Rock Guard, part number RM-4000.

Customer Reviews

Roadmaster Guardian Rock Guard - RM-4000

Average Customer Rating:  4.9 out of 5 stars   (39 Customer Reviews)

Protect your towed vehicle's finish and resale value with this car shield crafted from hollow rotationally molded high-impact polyethylene. Center panel easily attaches to the tow bar mounting bracket. Connecting rods attach to two side panels.


Received way earlier than was projected! Installation was a snap, quality of product is as advertised and it is exactly what I need for front end protection! Even with a mud flap on the coach there was still a tremendous amount of gravel hitting the pickup! NO MORE!! Strongly recommend!er


Very nice and sturdy protection for the front of the towed vehicle. Easy to assemble, attach, remove and store. I was surprised by how rigid it was even at highway speeds.


This rock guard will deflect anything you might kick up. Be sure to get the right guard for your tow hitch.


Simple design, easy to use. Perfect fit for my towed vehicle. No longer have stones sitting on the windshield after a trip.


Works great with my tow bar system and protects my tow vehicle very well.


Works really well and easy to hook up


Hi George, all the products that I purchased from you guys arrived in a timely manner and installed on my 2017 Jeep. Good instructions and good products. I sent you a picture of my install.


Installation was a breeze. Quick to mount, quick to remove, quick to store.


I purchased the Roadmaster Crossbar-Style Base Plate Kit w/ Removable Arms, The Roadmaster Nighthawk Tow Bar, Quick Disconnect Crossbar, Universal Hy-Power Diode Wiring Kit, and Roadmaster Guardian Rock Guard in order to tow my 2020 Ford Raptor behind my Class A. Everything bolted on beautifully and the craftsmanship was fantastic. Ordering from etrailer was easy and the parts arrived within a few days with no problem. I watched numerous [online] videos to learn how to install everything and they saved me a lot of time. Overall, I'm very happy.


I won't have a chance to actually use this for a couple of weeks, but I have no reason to doubt I will be highly pleased with it as others have been. For now, I just want everyone to know what a FANTASTIC place etrailer is to do business with. My Guardian arrived much sooner than I expected. This is a company that really delivers. Best company I have ever dealt with. I will update my review later. If you are going to get this, I highly recommend the Stowawy which allows you to easily store the Guardian on the hitch receiver on your motorhome.


The rock guard is easy to install. It provides a good amount of protection for the vehicle. It is light fairly light weight sturdy.

I use it on my Ford Xplorer along with the roadmaster rowboat and vehicle brackets


We have lots of stones on Idaho's roads so I wanted to protect the front end of my ranger while towing it. This guard is nothing to mount on the baseplate and should help much in preventing most of the rock chips.


a good solid product by Roadmaster that looks to protect the front end of my Jeep Grand Cherokee . the install went well with only one small problem, the Stowmaster tow bar pop-ups interfere with the RM-4000 when in the store position. Other than that it is a well built product.


Once you install the guardian carrier installing the Guardian is a breeze. The important step in the installation of the carrier and the guardian is driving your car onto the dolly to make adjustments to the carrier and guardian reference your vehicle. After you get it all together lt looks good and works. I'd buy it again.


Best price,free shipping,no tax.what else can i say.patrick did a fantastic job from a to z

Really good. thank you!!
Joe b - 01/28/2018


Installation was very easy and under 30 minutes.


I received the RM-400 on time, watched the installation video and installed it. I haven't used it yet but I'm confident it will do the job keeping the front end of our car protected while towing behind the motorhome.

However, the box didn't have the thumb screws.


Received a day earlier than expected. Janice took my order and walked me thru the process on how it attached it. She was right on. Looks good on my 2007 Ford Ranger. Took about a half hour to mount. Every time I order from etrailer. It's always the right part I needed.


The Rock Guard that came is as I ordered. As i had faith it would be. My first time ordering from them. They told me that it was in stock and that it would be shipped the next day and when it would arrive....It all took place...Keep up the good work.


Great product, great price,fast shipping and easy to install..... I also went with the RM# 4750 for the extra protection...... Thanks to Sandy J. for all the're so very helpful...... Adrien A


The product arrived in two business days, absolutely amazing. Installation was easy and works great. What else can you say? Roadmaster items are well engineered and and always work together when they say it does. As long as you do the research on products, etrailer gets it to you fast.


I towed my 2019 Silverado Pickup behind my Motorhome from Lincoln, NE to Yellowstone National Park and everything worked great and was easy to hook up.


Looks like a well made product. I have mounted it, but won't road test it until next week. As always prompt shipping from etrailer.


This product is very easy to use. And after about 10000 miles in the last year I do not have any damage to the front of my Grand Cherokee!


Very good product. Good installation instructions and easy to assemble. Another quality product from Roadmaster.

Show More Reviews

Ask the Experts about this Roadmaster Accessories and Parts

  • What are the Dimensions of the Roadmaster Guardian Rock Guard # RM-4000
    The middle section of the Guardian Rock Guard is 37-1/2 inches wide and 26-7/8 inches tall. The two side panels are smaller at the top than they are on the bottom. The top, in width, is 15-1/2 inches but at the bottom is 18-1/8 inches. They are both 26-7/8 inches high as well. When open, the guard will measure 68-1/2 inches wide at the top, 73-3/4 inches wide at the bottom, and will be 26-7/8 inches tall. When the guard is folded up it is 37-1/2 inches wide and still stays 26-1/2 inches...
    view full answer...
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  • Does Roadmaster Rock Guard Work when Used with Motorhome
    Even with the rear axle of your motorhome being a decent distance from the rear of it there will still be rocks and other debris that will fly up from the wheels and potentially hit your vehicle. The Rock Guard part # RM-4000 will definitely help. Dually wheels like what your RV are known for throwing rocks a large distance. I have gotten rock chips on my car from semi-trucks that were a great distance in front of me.
    view full answer...
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  • Roadmaster Guardian Rock Guard RM-4000 Recommendation
    The Roadmaster Guardian Rock Guard # RM-4000 is a great choice for a way to protect the front end of your vehicle as it is being flat towed. This one may not be as tall as the one you currently have but due to how close the towed vehicle is to the tow vehicle the taller guard would not be necessary. The rocks that would end up thrown from your tow vehicle wouldn't end up high enough to clear this guard. It will work well for you. If you check out the reviews of this product you will see...
    view full answer...
  • Rock Guard Recommendation for a 2010 Chevy HHR Being Flat Towed
    Priority one would be to keep the tow bar level. Otherwise you will wear out suspension and tires. As long as your Roadmaster base plate aren't MX or MS (they won't be), the correct Roadmaster Guardian Rock Guard would be the part # RM-4000 which will protect the front of your 2010 Chevy HHR.
    view full answer...
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  • Does the Roadmaster Guardian Rock Guard # RM-4000 Blocking Air Flow Cause Problems
    Is there a reason you would need air flow to your vehicle while it is being flat towed? The engine shouldn't be on so there would be no reason it would need air flow to the radiator. Also, on modern vehicles the radiators pull air from underneath the vehicle, so if for some reason your radiator did need air flow it would still get it since this does not block air from getting to the under side of the vehicle.
    view full answer...
  • Availability of Front End Vehicle Protector for Vehicle Flat Towed with Blue Ox Tow Bar
    The Kar Gard II you mentioned has been discontinued for a couple years now but we do have the original Kargard part # BX8870 still available. This is a hard shield for the front of the vehicle instead of the fabric style of the II which isn't around anymore. I attached a review video for this for you to check out as well.
    view full answer...
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  • Does Roadmaster Rock Guardian Work with Roadmaster Tow Bar
    Yes the Roadmaster Rock Guardian part # RM-4000 does work with the Roadmaster tow bar setup you have on your 2006 Lexus GX 470. I attached a review video for more info on this as well.
    view full answer...
  • Adapter for Attachment of the Roadmaster Guardian Rock Guard to a StowMaster 5000 Tow Bar
    As long as the StowMaster 5000 tow bar that you have has Quick Disconnects, Item # RM-201, then the Roadmaster Guardian Rock Guard, item # RM-4000 will work with your towbar. If you do not have the # RM-201 quick disconnects you will need them to adapt the Guardian Rock Guard to your tow bar setup. The Roadmaster Guardian 2nd Vehicle Kit, item # RM-4000-1, is designed to attach the guardian to a second vehicle with quick disconnects.
    view full answer...
  • Will The Roadmaster Stowaway Storage System Work With The Roadmaster Rock Guardian
    The Roadmaster Stowaway Storage System # RM-4000-40 will work with the Rock Guardian # RM-4000 only and that is not compatible with D ring bumper mounts. The Tow defender # RM-4750 however will fold and up store on your motor home and that solution is compatible with D-Ring Bumper mounts. Included are video resources with more information from here.
    view full answer...
  • Will the Guardian Shield Mounting Bracket RM-2000-8 Fit a Kendon Motorcycle Trailer?
    I can definitely say the Guardian Shield Mounting Bracket # RM-2000-8 will fit the # RM-4000 Roadmaster Guardian Rock Guard. However, to mate this to a trailer or tow dolly that is not a Roadmaster, you will need to double check and make sure your Kendon trailer has a tongue/frame tube with a width of 3-1/4 inches or less. If your trailer follows this guideline, you are good to go. If you do not have a tongue/frame tube that is this size, you will most likely need the Roadmaster Guardian...
    view full answer...
  • Windshield Protection Recommendations For Flat Towing
    The purpose of the Roadmaster Guardian Rock Guard, # RM-4000, is to not only protect the finish and front fascia of your vehicle from rocks and other road debris, but also to keep rocks and gravel from ricocheting off of the vehicle and hitting the windshield or motorhome. To protect the windshield from rocks and debris that may make its way over the Guardian, I recommend checking out the Roadmaster Tow Defender, # RM-4700. The Tow Defender stretches from the receiver to the tow vehicle...
    view full answer...
  • Protective Guards and Screens for Towed Jeep Wrangler Unlimited
    If you are looking for a protective screen or guard for a vehicle being flat towed behind a motorhome we do have such products. Both types of products are displays on the two linked pages. These include products like the Roadmaster Guardian # RM-4000 and their Tow Defender screen # RM-4750. If you are looking specifically for a windshield cover we offer several that are displayed on the other linked page. These not really intended for use while towing.
    view full answer...
  • Are the Roadmaster Cable Anchors Compatible with the Roadmaster 4000 Guardian Rock Shield
    My contact at Roadmaster confirmed with me that the Roadmaster Cable Anchors, # RM-910653, are compatible with the Roadmaster Guardian Rock Guard, # RM-4000. The cable anchor will mount to the bottom of the crossbar bracket using one of the pre drilled holes. The rock guard mounting brackets will mount on the crossbar brackets using pre drilled holes.
    view full answer...
  • Will Extra Parts Be Needed To Install The Roadmaster Tow Defender Protective Screening?
    The Roadmaster Tow Defender Protective Screening # RM-4750 will work great to keep your 2016 Ford C-Max protected from any road debris kicked up from your Motorhome. This system comes with all the hardware you need to connect the system without any extra parts needed. It fits Blue Ox tow bars with Blue Ox brackets, Demco tow bars with Demco brackets, and Roadmaster motorhome mounted tow bars. It weighs 15 lbs and rolls up to 4 inch diameter for storage. It consists of the heavy duty...
    view full answer...
  • Will Using Roadmaster RM-4750 Tow Defender on 2012-2015 Honda CRV Cause Transmission to Overheat
    According to Roadmaster, the Tow Defender, part # RM-4750 would work perfectly fine with a 4th Generation (2012-2015) Honda CR-V with no concern needed regarding transmission cooling. This caveat about transmission cooling is something GM has started putting in the owner's manual for later model vehicles. The way the Tow Defender sits when installed, roughly at the height of the vehicle's front bumper, will still to allow plenty of airflow. Plus, the open weave or screen-like nylon fabric...
    view full answer...
  • Will Roadmaster Guardian Rock Guard Restrict Airflow on GMC Acadia
    Since your owner's manual states not to use a vehicle mounted guard when it's being flat towed I have to recommend adhering to this advice. While most likely you would be fine, if anything were to go wrong because of the restricted airflow it would not be covered under the vehicle's warranty. With this in mind I strongly recommend the Roadmaster Tow Defender # RM-4750 instead, which will attach to the base plates and tow bar on your setup to keep gravel and debris down and away from the...
    view full answer...
  • Can Roadmaster Rock Guardian and Tow Defender Screen # RM-4700 be Used at Same Time
    The Roadmaster Tow Defender Protective Screening # RM-4700 and the Roadmaster Guardian Rock Guard # RM-4000 that you referenced can fit together. The screen can easily store on the tow bar when not in use but the Rock Guard needs to be removed from the tow bar when not in use. It does fold up for easy storage though.
    view full answer...
  • Which Vehicle Protector To Use with Roadmaster Falcon Tow Bar
    The Roadmaster Guardian Rock Guard # RM-4000 would be the one to use with a Roadmaster Falcon # RM-520 as it is designed for use with Roadmaster tow bars that have quick disconnects. The Blue Ox Kargard is designed for use with Blue Ox tow bars so it would not be what you need.
    view full answer...
  • Recommended Vehicle Guard for 2017 Jeep Wrangler Being Towed Behind RV
    To protect your 2017 Jeep Wrangler while it's being flat towed behind an RV I recommend taking a look at the Roadmaster Tow Defender # RM-4750. This heavy-duty nylon screen will do a great job of deflecting rocks, gravel, and road debris down and away from the Jeep. It fits Blue Ox tow bars with Blue Ox brackets, Demco tow bars with Demco brackets, and Roadmaster motorhome-mounted tow bars. I have attached a short video demonstration that you can also check out. Another option that will...
    view full answer...
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  • Will the Roadmaster Tow Defender Protective Screening Work With a Blue Ox Tow Bar
    Whether the Roadmaster Tow Defender Protective Screening # RM-4750 will work for your set up will depend on what base plate kit and tow bar you have. We know that you have a Blue Ox tow bar, if the base plate kit on your 2022 Chevrolet 1500 is also Blue Ox then yes, the Roadmaster Tow Defender Protective Screening # RM-4750 would work. Roadmaster Tow Defender Protective Screening # RM-4750 Fits: -Blue Ox tow bars with Blue Ox brackets -Demco tow bars with Demco brackets -Roadmaster motorhome-mounted...
    view full answer...
  • Ways to Install the Roadmaster Guardian Second Vehicle Kit
    You can install the Second Vehicle Kit # RM-4000-1 in two different ways. I attached a picture that shows how either way it can be set up. Option A will put the Guardian closer to the vehicle and Option B will push it further away. So to answer your question directly yes, as long as the holes line up the # RM-4000-1 will install and work fine.
    view full answer...
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  • Can the Roadmaster Stowaway Storage System Store Both a Tow Bar and The Guardian Simultaneously
    You can use the optional # RM-222 car side quick disconnects to store both the Guardian # RM-4000 and a tow bar with quick disconnects. The Roadmaster Stowaway Storage System, item # RM-4000-40, can be locked to the motor home drawbar with an optional locking hitch pin like the Trailer Hitch Receiver Lock - Stainless Steel Flush Design for 2 inch Trailer Hitch Receiver, item # e98882.
    view full answer...
  • Base Plate Kit For a 1996 Geo Tracker That Will Allow For Roadmaster Guardian Rock Shield
    The Roadmaster Crossbar-Style Base Plate Kit # 1007-2 will fit the 4-door versions of the 1996 Geo Tracker. If you do have a factory brush guard it will not fit. If you have a 2-door the Roadmaster Crossbar-Style Base Plate Kit # 118-15 will be the base plate you need. Both these kits will allow you to use your Roadmaster Guardian # RM-4000. We do have the Roadmaster Guardian 2nd Vehicle Kit # RM-4000-1 if you are using this with multiple vehicles.
    view full answer...
  • Can a Roadmaster Tow Bar Attach to a Blue Ox Base Plate Kit
    Most likely by Roadmaster 5000 tow bar you are referring to the Tracker part # RM-020. Which if so there currently isn't an adapter available that will allow it to connect to Blue Ox tow bars. If you have a different tow bar check out the link I attached to the right that shows a chart that show what adapters work with different tow bars and base plates.
    view full answer...

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