Mounting solar arrays to the roof of a Bigfoot

Thanks. The mounts are surprisingly inexpensive, $24 for a set of 4 corner pieces, $15 for a pair of side pieces, free shipping. When you see the picture you think they are a thin plastic molding like you are so used to getting, but they are a very substantial piece of plastic. They have a recess in the base but are otherwise solid. I have milled the base down on this one, they start out about 3/8 thick: