Not much your camper could be "liable for" unless it falls off the truck, lol, in your scenario or someone has a couple too many cocktails and falls out the back door!
I would not bother. I wouldn't even inside ours except it is stored in the shop all year and if the shop somehow burns down, the camper isn't making it out alive...but don't have liability on it, just damage insurance since it's super cheap.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold