After 10 years I'd be surprised it if didn't develop a leak or two, especially without maintenance. Did you follow the owners manual and inspect the roof, windows, and all joints for cracked and dry caulking? Like it or not that's the owner's responsibility. It's not a quality issue. It's just the way RVs are made.
There is no design that's perfect for everyone except for the one you build yourself. For example, our current trailer lacks a couple of things, notably a drawer. Seems like a no-brainer, right? Well the rest of the floor plan is ideal for us so the lack of drawers was not a show stopper. I'm having some custom drawers made and will be mounting them in the bottom section of the pantry cabinet where there is lots of extra room.
Our current hybrid trailer was purchased new last year. We traded an '03 Jayco Kiwi 17a that we also bought new. That trailer replaced a '93 Jayco 1208 PUP that was purchased new. I kept up with the maintenance and the only leak I ever had was a small one on the Kiwi that was easily fixed with Eternabond tape. Overall Jayco makes pretty solid trailers but their fit and finish is lacking. On every one of them I've had to make adjustments to things like door latches, tighten screws, etc. Despite taht I'd buy a 4th Jayco in a heartbeat.
2013 Jayco Jayfeather X20 E, 2008 GMC Sierra 1500 Crew Cab Z71 SLE