My truck has a crappy factory trailer hitch. It consists of what looks like 1-1/2 inch square tubing mounted to the frame and a peice of flat stock bent in a U shape mounted to the bumper. There is another peice of flat stock like a tongue sticking out from the middle of the bumper under the licence plate. It is connected to the square tube and the U shaped peice. I want to remove this and install a good, old fashioned, class 3 hitch. My problem is that on one side the nut and bolt spin together and there is no way to put a wrench on the bolt. I have tried using the air hammer/chisel with no luck and its so close to the gas tank that I dont dare go after it with a cutting wheel (sparks) or try heat. The other side is stuck also. Anybody got any ideas that I have not thought of yet? There has to be a way. I just dont know it.