Been trying to figure out how to remove the gas tank from my 1977 Dodge M880 5/4. Its got the straps that hold it in. The straps are bolted into the frame. My problem is I can't figure out how to get to the nut side to keep them from turning. The nut is either inside the frame or behind the gas tank. Either way I can't get to them. Anyone know how to get this tank out?