How about those interlocking foam floor tiles. They make the more "adult" version
click here and for kids rooms
Click here too.A few years ago I remodeled one of our bedrooms for my grandson when he and my son came to live with us. The carpet in the room was completely removed and these put right on the raw wood. It was easy, and not costly at all. They've held up for 4 years now and the corners have not pulled up. In your pass-through area in your camper, you could put a rug on top of them. I put a run in my pass-through compartment in all my TT's and now the bay areas in my 5er. I also carry a couple of those foam squares to use outside when yard mats just don't seem right.