The FWC upgrade has bigger plates like that on the inside, and a climbing hanger type of connector on the other side rather than a simple eyebolt. The hanger has more surface area than the original eyebolts too. I tested that one day when we were trying to take the camper off of the truck and forgot to undo the turnbuckles. YMMV, but I found that the new mounts were strong enough to lift the camper and the rear of the truck off of the ground. Doh!