What sort of tiles do you now have? Removing ceramic tile is a major chore! Glued-down vinyl can be tough as well. Whatever it is, cleaning up and smoothing the subfloor for the new stuff is the key to success.
As for new flooring, I suggest a good grade of vinyl plank or vinyl sheet, something that runs $3/sqft or so. The better grade stuff looks much better, goes down easier, and survives the temperature & humidity extremes of an RV much better. Engineered wood works well too, as does cork. Laminates like a more temperature stable environment and lower humidity, but again the better grades may be OK. I've got a small area of quality laminate in the bedroom and notice that it expands and contracts quite a bit (it's a floating floor) just in normal temperature ranges. I think a larger area might buckle.
Sheet vinyl has a "cheap" reputation but there are many excellent grades available that have a high end look and feel. Even Lowes and Depot have these grades, but you may have to ask to see their samples or books of higher grade vinyls.
There aren't a lot of sq ft in any RV, so top quality materials don't add much to the expense.
