OK, so Pros and Cons IMHO,
Pros
- One less thing to remember, it's always there. Yes, I have been on trips where tents were forgotten. No, it wasn't me!
- If your truck fits, your tent fits! Primitive camping spots don't always have a space, much less a leveled one, for a tent.
- You are up off the ground. So no worries, or at least less worries, about the wild life becoming curious about what's inside your tent.
- It's like being in a tree house, Its fun.
Cons
- Setup is pretty easy, but packing up can be work especially during cold/freezing conditions.
- Condensate under the mattress is always an issue when its cool at night. When your ground tent gets wet on a trip you take it home, open it up and drape it over something for a day. When your RTT gets put away wet, you go home and deploy it again (rendering the vehicle useless) and dry it out (outside! Where it may still be raining/Snowing).
- Loading and unloading gear/clothes/stuff from an elevated tent is more work then from a ground tent.
- Cost compared to equivalent sized ground tent. Gazelle = $300 vs RTT = $1000 +++++ depending on type and quality.
- Windy conditions are exaggerated with the extra elevation.
- Kids and heights can be dangerous.
- Gotta Pee? For guys no problem (pee bottle). For the ladies, climbing down.
- Wanna run a trail, pack'r up.
I guess there are really more negatives then positives. But, the plusses can be pretty convincing. I have property in Wyoming, aka Grizzly & Wolf country. I like being 7' off the ground, gives me a firing backstop (the ground) if needed.
You have to really think about the kind of exploring you do, the space you have to work with, and what your budget is. A cheap RTT is $1000. A really nice ground tent is $400 + a cot and sleep pad for $200.
Just do you, not what you see others doing. RTT's are 90% trendy.
Just my .02 cents.