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Are The Mount-n-Lock SafetyStruts MO34VR Needed For A Bumper Held On With I-Beams?  

Updated 07/23/2026 | Published 07/17/2026

Question:

I have I beams. Do I need the universal mounting I read about? etrailer RV Enclosed Cargo Carrier Kit with Cover - 60" # e32MV

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Expert Reply:

Hi Kenneth!

If you bumper is held on with I-Beams, it is definitely a good idea to grab the Mount-n-Lock SafetyStruts Universal Bumper Brackets - 4" to 4-1/2" - Qty 2 # MO34VR. This can help you support up to 400 pounds (when evenly distributed), and will get you just about the capacity of the etrailer RV Enclosed Cargo Carrier Kit with Cover - 60" # e32MV. Even if you don't necessarily "need" them, they will offer extra support to the bumper beam. I don't think extra support can ever be a bad thing. If it were me, I would install them regardless.

That said, you will also want to verify the capacity of the bumper with the trailer manufacturer if you haven't already. You are always limited by the lowest rated component, so that is something to be aware of.

What are you going to be carrying?

expert reply by:
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Lazer S
Mount-n-Lock SafetyStruts MO34VR Installed
Mount-n-Lock SafetyStruts MO34VR Installed
(click to enlarge)
Ron profile picture

Ron

7/23/2026

The safety struts mounted very easily, be sure to use a high speed steel step drill bit. Lowes ~ 18 bucks, drills fast. I plan on hauling 2" hitch bike rack and maybe a cargo rack in the 2" hitch at times. Hauling a deflated Avon raft

Lazer S. profile picture
Etrailer Expert

Lazer S.

7/23/2026

@Ron Good call on the drill bit. The steel they use on the bumpers can be pretty beefy and hard to get through. And cool raft! My dad actually had a vintage one growing up that he got from a boat he was working on (he built sail boats and worked on yachts in Southern California). I recall him wanting to restore it as it wouldn't hold air for very long anymore, but I don't know what ended up happening with it. Remember it being pretty cool though!

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