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Mount-n-Lock SafetyStruts Universal RV Bumper Support Brackets - 4" to 4-1/2"

Mount-n-Lock SafetyStruts Universal RV Bumper Support Brackets - 4" to 4-1/2"

Item # MO34VR
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Beef up your RV bumper and boost your weight capacity to 400 lbs to safely haul your generator and other heavy cargo. Universal design mounts to most RV frames to reinforce your bumper and prevent metal fatigue that causes your bumper to detach. Call 800-298-1624 to order Mount-n-Lock accessories and parts part number MO34VR or order online at etrailer.com. Free expert support on all Mount-n-Lock products. Guaranteed Lowest Price and Fastest Shipping for Mount-n-Lock SafetyStruts Universal RV Bumper Support Brackets - 4" to 4-1/2". Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (46)
  • Q & A (16)
  • Photos
  • Why etrailer?

Mount-n-Lock Accessories and Parts - MO34VR

  • RV Cargo Carrier
  • RV Bumpers
  • Bumper Parts
  • Mount-n-Lock

Beef up your RV bumper and boost your weight capacity to 400 lbs to safely haul your generator and other heavy cargo. Universal design mounts to most RV frames to reinforce your bumper and prevent metal fatigue that causes your bumper to detach.


Features:

  • SafetyStruts reinforce your RV bumper so that you can carry generators and other heavy cargo
    • Increases weight capacity to 400 lbs
    • Helps prevent bumper detachment from your RV's frame
  • Brackets mount to welded or bolted I-beam, S-beam, and single channel frames 6" or taller, and tube frames 4" or taller
    • Included standoff spacers are required for welded or bolted I-beam frames shorter than 6" or any size double channel frames
  • Optional spacer bars can be removed to fit around larger bumpers up to 4-1/2" wide
    • Gives you more space on your frame for proper mounting
  • Power-coated, galvanized steel construction resists rust and corrosion
  • Installation requires some drilling - drill bits and mounting hardware included
  • Made in the USA


Specs:

  • Application: 4" to 4-1/2" RV bumpers
  • Overall dimensions: 7-1/2" wide x 5" tall x 5/16" thick
  • Weight capacity: 400 lbs when evenly distributed
  • Quantity: 2 brackets
  • Limited lifetime warranty


Note: Bumper weight capacities vary by manufacturer. Please be sure to verify the weight capacity of your bumper with the manufacturer prior to loading.


Universal Application

Universal Application-Standoff Spacers

The included standoff spacers give you the flexibility to mount your SafetyStruts to most RV frames, making it nearly universal. This heavy-duty extension hardware is required for welded or bolted I-beam frames less than 6" tall and any size double channel frames where flanges stick out past your mounting surface. They also combat bolted-frame designs where bolts may obstruct your mounting surface. The standoff spacers won't be necessary if you have a welded or bolted I-beam, S-beam, or single channel frame 6" or taller without flanges, or a tube frame 4" or taller.


SafetyStruts w-w-o Space bar

These all-steel brackets also have optional spacer bars that are in place to allow a nice, snug fit around your standard 4" RV bumper. They can be removed so that the brackets fit around larger bumpers between 4-5/16" and 4-1/2" wide, or if your bumper is bolted to the frame and the bolts interfere with the spacer bar.


Spacer bars Used-Unused

If your RV's frame has less than 3" of mounting space, the spacer bars are the perfect solution to create that extra space to properly mount your SafetyStruts. Simply remove the spacer bar, flip it around, re-locate it to the outer part of your bumper, and secure in place with the included nuts and bolts.



1SNUHD Mount-n-Lock SafetyStruts RV Bumper Brackets - Universal Fit - 4" to 4-1/2"

Installation Details MO34VR Installation instructions




Customer Reviews

Mount-n-Lock SafetyStruts Universal RV Bumper Support Brackets - 4" to 4-1/2" - MO34VR

Average Customer Rating:  4.7 out of 5 stars   (46 Customer Reviews)

Beef up your RV bumper and boost your weight capacity to 400 lbs to safely haul your generator and other heavy cargo. Universal design mounts to most RV frames to reinforce your bumper and prevent metal fatigue that causes your bumper to detach.

- MO34VR
by:

etrailer.com is awesome. Always carry quality products with fast processing and delivery.



- MO34VR
by:

Great product. Whom ever put together the accessories (bolt, shims, etc) put a lot of thought into it. I had everything I needed to get a good job done.



- MO34VR
by:

Quick delivery, met my expectations completely. I couldn't be happier.



- MO34VR
by:

Easy install and great design!



- MO34VR
by:

Just what I needed to strengthen my bum per.



- MO34VR
by:

It was very good easy to install very happy with it .



- MO34VR
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Happy, think they will work great



- MO34VR
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Extremely easy to install and the directions are pretty straight forward. Great product



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- MO22FR
by:

Review from a similar SafetyStruts in Accessories and Parts


They fit well, however I would be more comfortable if the removable spacer was closer to the back square of the bumper



- MO22FR
by:

Review from a similar SafetyStruts in Accessories and Parts


Very easy to install. Looks good and will see how it works. My bumper is a tube frame welder to an I beam.



- MO22FR
by:

Review from a similar SafetyStruts in Accessories and Parts


Haven't installed it yet - but I'm going to get a 2" piece of channel 72" long and put clamp that on the lower edge of the 4" tube and then clamp the supports to it and mount the supports. A little extra support can't hurt.



- MO22FR
by:

Review from a similar SafetyStruts in Accessories and Parts


Challenging to install alone!



- MO22FR
by:

Review from a similar SafetyStruts in Accessories and Parts


easy to install, may want to use a bit extension to install the self drilling bolts as to get the correct angle.



- MO22FR
by:

Review from a similar SafetyStruts in Accessories and Parts


etrailer delivery was fast and I was kept informed throughout the shipment process. I will tell you that Customer Service was excellent in doing a price match for me against a competing site that carried the same product. Here's what you need to know about the install. Forget the self tapping screws and use a 3/4" high speed drill bit. Make sure to keep the bit oiled during drilling. Also you will need a minimum of 1 clamp to hold the brace in place. I would have rated the product a 5 star, but on my rig there is a L-brace also welded to the bumper. The washers included that are supposed to be shims are not thick enough to fit the bracket firmly against the frame. I had to use some additional washers I already had. But I have no doubt this will hold the extra spare tire I have added to my travel trailer.


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Ask the Experts about this Mount-n-Lock Accessories and Parts

  • What Side of Trailer Frame Does Mount-n-Lock SafetyStruts Install
    Normally the Mount-n-Lock SafetyStruts Universal RV Bumper Support Brackets # MO34VR install on outsides of trailer frame. I attached an install video for this for you to check out as well.
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  • Installing Mount-n-Lock SafetyStruts to Tube Frame
    From how you're describing your set up, it sounds like your bumper is attached to a tube frame, and there is a way for you to install the support brackets, which are the following part number: - Mount-n-Lock SafetyStruts Universal RV Bumper Support Brackets # MO34VR What you'll need to do is drill small holes into the tube frame, and then use the included self-tapping bolts to mount the brackets. I have added cut outs from the instructions which show how the brackets install to a...
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  • Is There Resource For Indicating Bumper Capacity on 2019 Chaparral For Bumper Cargo Carrier e83YR
    Good question, and there isn't an online resource that I was able to find so there are a couple of things you can do to find out the bumper capacity on your 2019 Chaparral so you can safely mount the cargo carrier you asked about, which is the following part number: - 24x64 etrailer Cargo Carrier for RV Bumper # e83YR The first and easiest is to check and see if there is a sticker or placard on the bumper indicating the capacity; this is somewhat common and is often on the back of...
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  • Comparing Mount-n-Lock SafetyStruts MO34VR and MO22FR
    I would be happy to help! The only difference between the Mount-n-Lock Safety Struts # MO34VR and # MO22FR you were looking at is the hardware used to attach them. The # MO34VR uses nuts and bolts where the # MO22FR uses self tapping screws. Since both have the same 400lb load rating I recommend going with the # MO22FR as it will be the easiest to install. This will allow you to use the Ultra-Fab 2" Motor Home Trailer Hitch Receiver for 4" x 4" Bumpers - 3,500 lbs # UF35-946402...
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  • Can The Mount-N-Lock SafetyStrut RV Bumper Support Brackets Be Used To Support Electric Scooters?
    The Mount-n-Lock SafetyStruts Universal RV Bumper Support Brackets - 4" to 4-1/2" # MO34VR will increase the RV bumper's weight capacity to 400lbs. This will fit 4" - 4-1/2" bumpers which looks to be what is on the 2017 Avenger RV. As long as the combined weight of the electric scooters and carrier does not exceed 400lbs, then you will be fine using this product. I attached a demonstration video to help you out.
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  • Parts Needed to Carry 2 E-Bikes on the Back of a Travel Trailer
    As long as your 2020 Sonic by Venture has a 4" bumper then this set up should work for you because the Mount-n-Lock SafetyStruts Universal RV Bumper Support Brackets # MO34VR will fit bumpers 4" to 4-1/2" and the Curt RV Bumper 2" Trailer Hitch Receiver # E-100 will fit 4" bumpers. The SafetyStruts will increase your bumper weight capacity to 400 lbs. and the Curt RV Bumper 2" hitch receiver can handle up to 350 lbs. in tongue weight which is what the bike rack and bikes would be impacting....
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  • Will Mount-n-Lock SafetyStruts Standard RV Bumper Support Brackets Work for Generator Support
    The Mount-n-Lock SafetyStruts Standard RV Bumper Support Brackets part # MO34VR are designed to fit 4" x 4" or 4-1/2" x 4-1/2" square RV bumper. If this is what you have then it will work well for you. It provides a 400 lb weight capacity. In many cases, the RV manufacturer limits the weight capacity of the rear bumper too severely unless the side brackets are welded. These reinforcement brackets are a great way to increase that capacity without the need for welding. If you don't...
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    I would not be able to speculate on the rear bumper capacity for any one particular trailer especially one this old but if you feel you will be exceeding this with the Curt RV Bumper 2" Trailer Hitch Receiver part # E-100 you can add supports, the Mount-n-Lock SafetyStruts Universal RV Bumper Support Brackets part # MO34VR. The other options would be a frame mount trailer hitch, the Adjustable Width Trailer Hitch Receiver part # 13703.
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  • Recommended Trailer Hitch Receiver For Jayco Travel Trailer To Triple Tow Small Utility Trailer
    It sounds like you have the Curt RV Bumper 2" Trailer Hitch Receiver # E-100 installed on your Jayco trailer. If that is the case you can tow with it, but you are correct that the bumper on your trailer is really the weak point. One option is to use the Mount-n-Lock SafetyStruts Universal RV Bumper Support Brackets - 4" to 4-1/2" # MO34VR to reinforce your bumper for additional strength. The option I recommend is going with a frame mounted trailer hitch receiver like the Curt Adjustable...
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    Yes we do have the Mount n Lock SafetyStruts part # MO22FR for standard RV bumpers or the part # MO34VR for a universal setup.
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  • Recommended Frame Mounted Trailer Hitch Receiver For Jayco Eagle 320RLDS
    I have another option that may work for you, but Unfortunately the brackets on the # 13703 cannot be flipped which my contact at Curt confirmed. The Adjustable Width Trailer Hitch Receiver for RVs, 22" to 66" Wide # C13704 can be bolted or welded to the bottom of your I-Beam frame, but is only fits frames up to 66" wide where the # 13703 fits frames up to 72" wide. If your frame is not wider than 66" then this would be your best bet, and has a 350lb tongue weight rating though you will...
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    If you want to use 24x64 etrailer Cargo Carrier for RV Bumper # e83YR and be able to use it's rated cargo weight capacity, you can use reinforcements like Mount-n-Lock SafetyStruts Universal RV Bumper Support Brackets # MO34VR. This will boost your weight capacity to 400 lbs so you can safely haul your generator and other heavy cargo.
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  • Recommended Trailer Hitch for a Forest River Cherokee 284DBH
    The Curt RV Bumper 2" Trailer Hitch Receiver, # E-100 is designed to fit standard 4" x 4" rear bumpers providing ability to tow a trailer up to 3,500 lbs. However, just because this component is rated for that does not mean the bumper on your RV is; you will need to confirm with manufacturer for spec on your Forest River Cherokee 284DBH. In addition, you will need to check legality of towing a bumper pull trailer behind a bumper pull trailer. Pulling a trailer behind a 5th wheel is frequently...
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