Choice#1-interlocking vinyl- gets my vote. Easy to replace if one panel/tile tears, gets a hole, whatever. I've used it in rental properties with great success and lots of durability(12 yrs+ and counting). My personal fav manufacturer is Amtico, who invented or at least first marketed the product in the USA, about 30 yrs ago. Amtico was recently sold to Mannington so if you opt to use it check those specs well. You can buy it online but not at any of the big box stores. It's not inexpensive but you'll never redo the RV's floors again.