I bought 2 sets (4) of these to install a generator box with a generator on the back of my caravan. The box and generator weigh about 250 pounds if I put in a propane tank and a full gas tank. I used to have a hitch there for the receiver and a trunk. There were two issues, it was too low to the ground and I couldn't get rid of the movement throughout the setup. This works much better. The box is now 6 inches off the ground and solid with no movement. And this works great with a thin bumper, just make sure you reinforce where the bumper meets the frame. I made this using bolt on mounts which you can also buy from Revain. I couldn't find a part number, just look under the RV Bumper Booster. I'll try to post some photos later.
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