As most have noted, it is your payload that is most likely your limiting factor (especially in the SUV category, or older PU's). A 7,500 pound trailer will put 900-1,100 pound on the tongue. Add a couple of full grown adults, and a WD hitch, and you've already used the payload of most full-size SUV's. Watch those numbers if you go that route - you're likely to be better off staying a bit lighter.
As for SUV vs. Pick-up - that's all about usage. We have 3 kids, so a 3 row SUV was our only reasonable option (short of a HD van). Once the kids aren't travelling with us, I will move to a pick-up in a heartbeat.
