Our RV doesn't have the walk around bed or levelers and of the two I think levelers would be our preference. One less thing to fuss over when arriving at camp.
You can even have fun in a leaky RV, just know that it won't last long if the leaking continues. Lots of folks have loved rubber roofed RV's too.
I don't put a lot of faith in ANY sales people, I'm always on the lookout for info but better to get it from research on this forum and other websites and books than to ask for it from someone who will tell you anything to make a sale. One of the best ways to learn about RVs is to get one and learn as you go. I know a ton more now than I did 5 years ago when we bought ours and hope to learn more (although not through having things break down!) Hit the road, have fun.