If the kids are in high school, I would be the rig that you and DH want. Like others have said, let the kids set up a tent. If they choose the tent, it can be a very fun experience. They get to pick the gear that suits them.
We're a family of five. We used to camp with my mom in a 28' class C with twin beds. It worked great except for having a car to run around in without breaking camp.
We now have a T@B. When we use our add-a-room, there's room for our 3 to sleep on cots or air beds. Since they're now 24, 23, and 20 it's rare we're all together anyway, but room if we are.
You could go with an add-a-room that attaches to your awning instead of a stand-alone tent. I've heard that type is a hassle, but maybe the kids would benefit by the shared space with the trailer, as well as the AC/heat. Our add-a-room attaches in a completely different way than your average trailer, but our AC cools the room very well and it acts as one space.
