The front tie downs connect to brackets in the bed of the truck I installed using the front bed bolts and I added another nut under the bed and to Simson brackets attached the the camper using 8 bolts, since the box sides and wings are only 3/8" plywood. I used the Happijack spring loaded tie downs.
I ended up rotating these 180 deg. as I notice when I had something else tied they started to rotate on their own.
For the rear mounts I replaced the stock bed bolts with 180mm long bolts that go through floor of the camper in to the frame of the truck. I added extra nuts under the frame for these bolts too.
What keeps the wings from collapsing? The end walls support the side walls which support the wings. Look at the photo where the camper is supported by the jacks, notice how the entire camper is supported by the 18" long jack brackets? What keeps the center of the camper from sagging? Same thing that keeps the wings from collapsing.