With these completely flat Black Sheep and LeTech racks with the L track or T slots (whatever they are called), what is the best way to mount a roof top tent to one of those? Black Sheep showed a RTT mounted to their rack and it looks like they had to run additional vertical bars to the rack to attach the tent: at the 12:52 mark in this video. Is that the only solution? The LeTech rack looks very sharp. I'm curious to see what it weighs/costs. Also, how would one mount side brackets to the LeTech rack for mounting, for example, a 270 degree awning? I see the L track on the side of the Black Sheep rack would provide easy mounting points for such brackets.