owner had the same problem. He may have had to drill off the screw heads. I suggested an impact driver, the type that you hit with a hammer, but be careful. I also have one that fits into an air chisel gun. Another Uhaul
owner may want that hinge, or the whole bunk assembly if you decide to sell it. Our Uhaul
is missing that big "bubble" piece that the bunk sets on. Much more room without it. I installed a Casita
captains chair in the front. Do you know that there is a Uhaul facebook group where you will find a lot of info.
Edit; like Mike shows is the tool I'm referring to