Man I feel bad about this. Seems like your ins is jerking you around when they can subrogate everything to the at fault party.
Always hard to tell what's wrong over the Internet, but the trailer seems like it's totaled to me and well, the truck may have escaped major damage easily if it just bent the hitch.
Either way it's in your best interest to get ahold of an attorney yesterday IMO as you're halfway down the road to receiving a halfway fixed camper back.
And the more they do to the camper, the more that's invested in it for repairs and harder to get a total vs repair.
Good luck buddy.