Look at films/pictures of crushed side beds from people when camper is parked in camping spot, from people pulling out of and/or backing into the camper to hookup/unhook. Learn from Their Mistakes.
With campers/trailers, bad things can happen and when they do they will happen quickly. Vision is very poor around you when going down the road or going into/out of campgrounds. "Where did that car come from that you just cut off" and 'I never saw that limb that just ripped off my air vent and AC cover. :
When pulling out or into a 'site'/drive, know where all of your people (and everyone else) are. Have your animals/dogs... in the truck with you or in someones arms, as we all know.... 'when truck moves' it is time go some where and the VERY LAST thing you want to do is run over your dog/wife/child.
As as my famous brother always says "Don't Drive Like My Brother"
(The Tappet Brothers)