That's what my PUP looked like when the spring broke last year.
It also did not want to level right. The door was out of alignment while the spring was broken.
It's not a big repair if you are not in the middle of a trip.
Strongly suggest you have this checked out before traveling with it.
We ran into the same problem a couple years ago. What a miserable night!
We bought some no see um netting to put up in the wing bed.
We have not had to use it yet, so can't report on how well it works.
We also got some Picaridin bug repellent to use inside the the camper as it will not harm plastic or nylon fabric.
Have you tried contacting Rockwood (Forest River) directly?
They will supply parts.
I don't know how old of a camper you are referring to or what parts you need, but they may have what you are looking for. I would expect that many of the older camper parts are the same as the newer campers.