Re: Horrible floor
I feel your pain, trailers truly are hideous pieces of garbage!
About your problem. The fix is to cut out the hole and replace the material. You have two choices, cut to the side of the joist at each side of the hole and attach a cleat to carry the new material or you can cut to the centerline of the joists.
You cut a patch to fit the hole you've cut. Before installing it, attach cleats to the unsupported sides of the hole. you want the cleats to be almost as long as the hole is, just not touching the joists on either side as this will cause a squeak.
Now you're ready to place the patch and attach it. I would use screws because they will hold better and be easier to install along the unsupported areas.
Now you're ready to place the floor covering back. If it's carpet, just flop it back and restretch it. If it's vinyl, then you'll need to relay the entire floor. You could patch it, but those don't generally work very well or look very good.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!