The setup is extremely fast and you have way better protection from wind and water/rain. You are off the ground and the temperature is much better in the RTT. Up in the air camping allows you to get away from the creepy crawlies and the animals that swing around your campsite to say hi at 2:00am. Ground camping takes some finesse when you have to move rocks, dirt, sand and when the tent is on your vehicle all you have to do is make sure the vehicle is level. Breakdown is minutes and you are back on the road or trail to your next adventure.