in that part of the us, the truck camper probably don't have a title. it comes with an MSO, but titles are not needed, which means you might be able to sell it with just a sellers receipt
according to nada guides that 2018 770 camper might have a resale value of $12K unless you have destroyed it. Any thought of listing it for sale? it might be easier to sell it now by providing a proof of purchase notarized to seller, than continue to pay on loan until its done.
you know what a repo will do for you credit, for maybe 7 years or more. Don't forget stuff like car insurance also is related to credit rating, so its going to cost you to walk away. coming up with that couple grand to pay off loan might be cheaper than paying it to the car (and or home) insurance people.