Mike, Welcome, glad you joined us!
Your towing cap is good, and will meet many travel trailers weights out there.
How far are you willing to drive to purchase your perfect trailer?
Are your kids lil or teens? Some bunk set ups are really for smaller children, But that being said there are bunk options out there. Just might be a little harder for find.
Unfortunately, as far as "models". As well as which brand to buy, your really gonna just have to look at all brands that might fit your needs ( bunk, etc) as they come up for sale
......... In the used market it's hard to be really picky, unless your willing to spend lot's of time looking. Don't let that statement scare you, the perfect trailer might pop up for sale next week!
Finding a roadworthy, clean trailer that fits your needs will be the must haves. Then if you get really lucky, you will find the perfect trailer tomorrow,
Probably all brands have had some type of issue over the years. But lets be realistic, there are glass trailers 40+ years old out there still on the road.
So if a particular issue is associated with a particular brand, it can be fixed. I personally wouldn't worry about that. What makes the biggest difference in the used market is how well it was cared for by the PO. Find what will work for you first, issues can be resolved in most cases with these little glass trailers.
Wishing you luck in your search, hope the perfect glass trailer finds it's way to you and your family soon. So you can get out there and start creating great memories........... Again, Welcome!