I installed a vinyl imprinted laminate interlocking plank in my trailer five years ago. It looks like the day I installed it.
FWIW, I have a covered under-belly and installed a rubber underlayment under the plank, which also has an attached backing. The laminate I installed was one of the cheaper ones on sale at Lumber Liquidators.
If you live in the PNW or are one of those campers that can't keep water off the floor, I'd suggest to use a laminated plank that is made for wet areas. Pergo brand is one brand that makes such a product.
Sheet vinyl, if installed correctly, is impervious to water. The subfloor is not.
