The item you linked has the locking pins, I would use that to make sure it cannot move, it also has the bracket that attached to the side of the roof to stabilize. I would try it first, the Wingbits is not super heavy. And the 4DSKY is just a simple antenna that’s weighs like nothing. I’ve seen people put the Baicells 430H from helium on these before and they are 10.7LBS



