I replaced the floor on my 2004 25C10.6E Bigfoot TC and it was a total pain. But was absolutely worth it and made the world of difference in appearance.
Yes, Bigfoot laid the carpet and linoleum down before installing any furniture and cabinets so unless you plan on gutting the entire thing, your best bet is to nearly cut along the edges. That part was simple enough but I'd recommend one of those hooked blade tips you can put on your utility knife, as they're specially designed for cutting carpet. Bigfoot clearly never intended for that carpet to be removed.. there are a million staples holding it down. You're going to want fencing pliers or tower pincers to get all those staples out. And a breathing mask!
The linoleum peels up easy enough but I did have to brush on some heavy duty adhesive remover (the super toxic goo that comes in a metal can) on the tricky spots to get a nice and clean working surface.
Finally... there were a few areas where there are some raised screws and bolts that were going to interfere with my vinyl plank flooring that I was going to install (wouldn't have been an issue if I were using carpet). I needed a flat surface so I went ahead and sanded down the bolt heads (with an electric sander.. lots of sparks flew). I'm crossing my fingers that I'll never need to remove these screws and the electric sander decimated the screw heads.
For areas like the the basement door and the door under the dinette, I got rid of the hinges completely. I didn't really need them. The basement door just sits in there and I fashioned the pull handle in the center of the door so I can just pull it up when I need access. And the dinette door just flips up and mostly stays in place. Sometimes after traveling a bumpy road, it'll push loose a little and I just have to shove it back.
For the dinette edge and the edge of the step to the bed, I used a piece of L-shaped aluminum. I glued it on with some heavy duty mastic.I made cuts in the aluminum edge so that the dinette door could still open. **be sure you remove the screws from the step above the circuit breaker so you don't lock yourself out of there by laying floor on top.
Overall, the flooring was by far the most complicated process of my Bigfoot renovation. I used Allure Vinyl Planks that I bought from Home Depot. I laid the floor width wise which made it a little trickier but looks great (makes the camper look a little wider). I glued down the planks, which DOES void the warranty, but I had no other choice due to the layout and trap doors. I also didn't care since it was only 3 boxes (~$150).
I finished the edges by filling the gaps and edges with some caulk to match the cabinets.
I hope this helps. Feel free to DM me with any specific questions.
2013 Ford F350 6.7L Powerstroke Diesel DRW Lariat Crew Cab 4x4
2004 Bigfoot 25c10.6e
Full-timer