I bought our camper from a rental fleet. When I went to pick it up they loaded it on the truck and took it inside the shop. Their cleaning lady then spent 5 hours cleaning the camper, while the mechanics installed the tie downs, etc. She had a commercial grade steam cleaner and the entire ceiling felt slightly damp afterwards, so I assume she steam cleaned the ceiling as there isn't a lot of anything else to steam clean.
I would take it to a reputable carpet cleaner and let them handle it.I have had a bad experience trying to use a rented steam cleaner on a too dirty carpet that never looked right even after 2 steam cleanings.
The carpet is glued to a thin plywood, which is glued to the white bead board insulation, so removal and install of something different might be a challenge.
Good luck with your decision.
2014 Chevrolet 3500 CC 4X4 Duramax, Tork Lift Tiedowns, TorkLift Fastguns, Superhitch and supertruss
2009 Jayco 213 SOLD
2008 Bigfoot 25C9.4