Not all cars are rated for boxes so make sure you look into this.
Not only the weight and the box and gear in it, but the force that the drag puts on the roof rack. So make sure your car is rated for a box.
I know mine is NOT, so a 4 board rack system is what I use
aiidoneus nice cars btw !!!!
Deacon you have a 4 board system or "2" 2 board holders. In you pic on FB it looks like the later. If so you might consider hitting up a junk yard or order an extra cross bar and just throw it up there then you can mount the 2nd holder wider to accommodate your board and the shorter one for the kids boards.
Interesting, VW sells the previous year Thule through the dealer. So it would essentially be the same box. What car do you drive?