A few things that we very important in our search for a trailer, in addition to how much we could pull and the truck's payload...
1. Size of water tanks (especially if you plan to dry camp!)
2. Size of fridge
3. Storage - both inside and out of trailer
4. Construction Materials used (wood frame v aluminum frame, etc)
Once you figure out the price point, weight you're aiming for, and how many it can sleep, it helps to have a few other things to check off that list to narrow down the search. SO many options out there!