Another vote for 16" wheels so you can use at least 3042lb LT tires. Or at least get 6 lug 15s and they can be changed to 16"., later... BTDT. Smaller 5ers don't necessarily have a lot of storage. I prefer fiberglass for hail resistance. Avoid lite, cheap and entry level... You'll eventually spend more money on the low quality stuff, BTDT. We love our two slides... LR and bedroom. More slides are optional... we don't need or want more. We also love our rear kitchen for more counter space and for the traffic flow. Morryde, ezflex or equaflex are all good options. The bigger the basement, the better.
You'll be missing the best camping of all if you don't dry camp in the boonies!! Craig