For years I went back and forth over getting a RTT. I just could never justify it enough to make it happen. Height clearances, not just on the trail, but parking lots, etc. were a concern. Wind drag, higher CoG yadda, yadda are always the same no matter what. The bigger concern was mounting it if I got it. My rack is 48" center to center on the tubing. None of the RTT's I looked at would fit between them, so that meant either mounting it even higher on rails on the rack, or cutting one of the sides and putting it on a hinge. It sounds trick, but I didn't really want to butcher a nice Safety Devices rack. And I REALLY didn't want to have to buy a different rack so I could buy a RTT.
I wanted to have the option of removing it, but it wasn't practical. I didn't have anywhere to store it and wouldn't have anyone to help remove it if I did have space. A friend had the best setup. He would pull into the garage, unbolt the RTT from the rack and use a small atv winch to hoist it off. It would hang there, out of the way, until it was needed again.
If you travel with a bunch of rigs kitted with RTTs and have a small camp site, you will be figuring out which tent folds out which way. Folding out to the side of the vehicle effectively uses up 2 spaces. I always wanted zero additional footprint and would have had the tent fold out over the hood. The ladder could be shorter that way and hook onto the front bumper. You could use a case or something as a step to get onto the bumper from the ground. But, this means you'd have to figure how far forward the tent will have to be so the angle of the ladder is good enough to support the weight properly.
I'm used to carrying things on the rack at this point. Mounted dual jerry can holder. Camp kitchen. Now that I have a Skottle, I'm more inclined to start bringing the case with me. Firewood. It would be tough to loose all that space to a tent.