you must have one of those famous Argosy composite-alluminum floors....there are people here with experience with them, so perhaps they'll chime in.
what I'm thinking is that a "pergo" type laminate floor would work well, because it doesn't need to be "attached" in any way to a subfloor. you actually do just "lay it down". of course, it takes alot of measuring and cutting to get it to fit against all the fixtures and cabinets and so forth, but its free to "float" on the floor (so it can expand and contract with the extreme temps in travel trailers), its easy to take out if you change your mind later, (unlike anything that has to be glued down), its extremely durable, and not much heavier than carpet.
Along with the standard "fake-wood" laminates, they also make styles meant to mimick a vinyl floor. Then there's also bamboo and cork flooring ("real") that installs with the same laminate-style click together pieces.
search around on the forums, and you'll find lots. there are some pics in my photo gallery of my pergo "fake wood" floor. I really like the look of the cork, too...wish I'd known about it before I did the pergo.
'73 Safari 23'
'00 Dodge Ram 1500 4x4 QC