Keeping it simple, we found some chequer-plate effect lino from B&Q for the floor. When camping or at off-road events people are likely to get in & out with wet or muddy shoes, plus there's the bathroom area, which leaves not very much space for shag-pile carpet. The decision was just lino the whole floor and we could always throw a rug or something down to really tie the room together. One note on lino or maybe we should say “vinyl flooring” is that the modern soft stuff with a sort of foam backing is not as tough as old style hard lino. It's much nicer to walk on and presumably a little more insulating, but drop anything with a sharp corner on it and it WILL leave a hole.
This is it during the fitting - we trimmed it back around the step and edged with some aluminium strip from B&Q, in the end it looked pretty smart.
…well, it looks smart when there's not tools and junk everywhere:
Fitting literally involved throwing the lino on the floor & cutting it to fit round things. We didn't glue it down because we felt it was unlikely to need it (things will be built on top of it, it can't move far!) and once you cover stuff in impact adhesive it's an absolute ball ache to remove. The sides of the lino were left long, so they extend ~3“ up the wall. This means dirt & water don't have a corner to hide in and makes it a bit more “hose-outable”.