The most frustrating part of a RTT on a roof is setting up all the spring rods for the windows. It's frustrating on a good day and dangerous on a bad day standing on slippery door sills, tires, and bumpers with wet muddy boots. I had the chance to use a tent mounted about 6" above the bed rails on a Tacoma and it was awesome. I didn't have too many issues aside from the previously mentioned problem of not being to use the front most window but that isn't really a big deal. The last three vehicles that I've had with a roof mounted tent all had the same issue. One with Jerry cans, one with a wind fairing, and another with a storage box. No big deal.