Another vote for NRS. Add, subtract, move things around, and take it all apart for winter storage. Either the cat yokes or the universal drop rails. If you go with the yokes, get the 72 inch size. It gives you more options for coolers & dry boxes.
If you want a single piece frame and are mostly doing day trips, then there's a really sweet looking frame on the Canyon Inflatables sale page. http://www.canyoninflatables.com/#!salesdemo/c13br
"We are all visitors to this time, this place. We are just passing through. Our purpose here is to observe, to learn, to grow, to love....and then we return home."
Australian Aboriginal Proverb