Which 3-row SUV should I get to pull a travel trailer?

There's a 6door Mega cab in the tow vehicle section. That would do it for ya.
You CAN tow that with a big older suv as mentioned but you'll be overloaded unless you do some work to the rig.
Seeings you don't know much about vehicles and presumably towing, I'd reccomend you get a truck that is a little overkill to keep the 7 of you rubber side down.