Please ckntact an attorney ASAP. You are under no obligation to use the attorney after an initial consult unless you sign a retainer. This way at least you know where you stand legally.
I have a very hard time believing there is only $1000 damage to your truck. I bet there is hidden damage somewhere that will rear its ugly head down the line.
Get the trailer totaled and collect the GAP ins. Pay off the loan and buy a replacement trailer. I would never trust any trailer that had $17k damage.
By the way, from what I read in forums, Camping World is one of the worst places to have repairs done at. The maker of my trailer Grand Design, won’t even authorize warranty repairs at CW.
Since you are the injured party you have the right to have the repairs done at the facility of YOUR choice.
Good luck with all of this. Sorry it happened to you.