Some random thoughts: at least 15 years ago, I installed peel-and-stick "oak" vinyl planks in our (house) bathroom, I think they were made by Congoleum; and they have endured all these years and still look nice.
Last year, we had Home Depot's "Life proof" vinyl planks installed in our condo - one of the things I noticed was that they didn't have to be "acclimatized" by sitting inside for a few days before installation. Implies to me that they don't shrink or expand as much as other flooring? The drawback is the thickness of each plank - they are at least 1/4" thick, which might interfere with a slideout.
Last thought: depending on whether the RV is a trailer or MH, there could be uneven heat sources (like exhaust pipes) under the floor. I saw a converted van, whose owner has installed vinyl "coin flooring" and it bubbled up where it was laid over the cat. converter.