If you would like to make the towing experience the easiest, one of the trailers with width around 7 ft or less, like Oliver, is the easiest. Trailer tires and body width closely match the tow vehicle.
As far as teens camping with you, I'll share our experience in the little 08 Oliver.
We have the little side dinette drop down to a "twin" 24" bed, 6 ft long.
Honestly, according to our nephew, it's not the bed size, but the independence of his own tent, that draws him to a tent beside our trailer. Our adult daughter brings one or two friends, who love our eight person tent.
I would not consider sleeping really small ones in the tent. But, teens, they'd likely be happier.
Beyond that, I'm with John Davies, for the most part. I hate slides.and, I don't like wide trailers, beyond the 7.5 width. Even the Bigfoot and Airstream are pretty wide. Too wide for us, though the extra width allows more floorplan flexibility.
I saw that initially you thought 16 ft was long enough. Rent a tiny motorhome or van , or a tiny trailer like a tab on rvshare, and see how it works for you.
You don't want to buy a trailer too big, just because you might have a couple teenage grandkids from time to time, anymore than you would want to build a house to hold the whole family at Christmas, to clean and condition the rest of the year.
Just my thoughts. 17 ft is plenty for us. Room for one small grandchild, if and when we get so lucky.
Good luck in your decision, and happy travels.
Sherry