We camped in a Jayco x18d for 7 years, it's a 3 bunk hybrid, I believe it weighed about 3600 dry weight. You can sleep a lot in there, my biggest complaint was nowhere to sit inside except the dinette, but for only 4 people probably not a big deal. I really wanted the 3 bunk Rockwood with the slide out dinette, that thing is huge on the inside, but weighed about 800lbs more. At least those were the 2011 model years.
As far as maintenance the only issue I had when I sold it was the front bunk door had begun to rot due to a leaking seal. Didn't affect the rest of the trailer, but someday that door will need to be replaced. The good news is by shopping around and finding a large Jayco dealer, that door can be replaced for around $500 when the time comes.
The seals, especially on the front where it is slanted, are notoriously problematic. But that's just part of the deal with the hybrid. Its all a trade off.
Still, when you're only in the 5k-6k tow capacity, you can get a lot of usable space for not a lot of weight.
