They work well on the YJ, very solid. The forward two bolts are fore and aft of the firewall, lots of strength there. The rearmost bolt is about 4" long as it goes through the boxed section of body where the seatbelt mounts, more rigidity there as well. They've taken some hard hits on rock and never a problem.
My gas tank skid looks like the above pic too, tapers up quite a bit on one side. Don't hit it as much since the SOA. Hit it so hard once I bent the fuel pump sending unit over, and the jeep quit about halfway home from the offroad park. Pounded out the skid with a sledge, and the poly tank pops right back into place.
