We used laminate (not vinyl) wood flooring which is made of a composite wood/paper fiber with a nice bamboo top. Like Jim and Dave said earlier - it holds up great, takes a beating, has been in 90-100 temps with no AC (stored outside) and cold temps (in the teens) and it looks the same as the day it was installed.
Like Jim and Dave said - get water in it (soaked) and it will never dry out and with any humidity at all it can easily mold if it gets soaked. You won't see the mold until you pull the boards apart.
Brian - I'd go with a vinyl laminate tile like what you are looking at. Don't worry about the temps. Its the same vinyl they use for siding on houses. I'd leave the laminate in the bus for a day or two before you install so there is no temperature change when you install it. Do it on a dry day and use a good vapor barrier underneath and you'll be fine.
1984 Eagle Model 10S