That's all it takes? I'm always impressed by how much weight something so unsubstantial looking can carry. I figure you stick a pair of adults in that tent along with gear and you can easily have 100lbs pressing down on each of those four rack feet. But I guess when you do the math it is actually a 12sq" foot so that's really only 8.3lbs per sq/in. (Thinking while typing) Very cool sir, which RTT did you you get? If you don't mind, could you post up some pics when you've got it mounted and set up?