I really have no advice except I would visit all the dealers I could and just have a good look at anything in the length or size you wanted. Actually seeing these rigs , instead of just finding on the net, you can look at the workmanship of the different manufactures. This may help you further in deciding which kind you would like. You can't go by what the ads say, you have to see with your own eyes.
After your purchase, no matter the amount of time you took in deciding, you may still have boo boos, that have to be fixed. The more you investigate by actually seeing the different ones, the less you may have to deal with later. I would not just stick with the "new", several on here have bought really nice r.v's that are a couple yrs old and problems are fewer.
Good luck in your search, you're going to have fun, looking, and hopefully, you will share your experiences with us, so we can enjoy your search too.
CArol