The canvas is fine on the expandas, but the design of the rapids beds are better for wet pack up for sure, probably better for wet allround. But be warned rapid beds are not as sturdy if your kids are a tiny bit feral. The bases bend as witnessed many times at van parks. Also make sure you fit the beds, Expanda, rapid beds are not the biggest going around
For 45k you would almost get a new van with some serious haggling,certainly the Jayco. How many do you wanna sleep. I just got out of an Expanda because we only need 4 berth and have found a great floor plan in a poptop that works and is a 17ft van. Certainly looking at the dealers the expanda types vans are not as popular as they used to be. Good luck.