I used the lowes peel and stick planks in my 13 and was very pleased with how it turned out. As Greg said, it couldn't be easier to install.
The only issue I had with it was if you have stuff to slide on the floor, like your tote bins or, in my case, a porta potti, it will wear the color and pattern off the material. I had white streaks where the porta potti slide constantly from under my bunk.
In my 17, I laid a sheet vinyl product from home depot. I can't find the cherry color there anymore. I has held up nicely as well, except for where one of the floor bolt heads has worn thru. It is a temporary floor and I haven't leveled it yet. I just wanted the carpet out as I had a toilet problem and it started to mold from the moisture.