This was a pretty simple project. I wanted to remount the welder in my pickup so I would still be able to use all the floor space (4'x8') to haul full sheets of metal, plywood etc. I decide to mount it straddling the wheel wells. It's made of 2" x 1/8" square tubing and secure to the bed with 8 7/16" bolts. I put 1/4" x 2" x 6" pieces under the bed to further secure it. Maybe it's useful for others. Made it with, what else, the Bobcat using 3/32" 7018. I also made a new ladder rack. The base is 2 1/2" x 1/4" angle with 1 1/2" x 1/8" uprights. I welded the uprights to the angle at a 10 degree angle, bolted them to the bed and built the rest on the truck except the top. The top is all Aluminum 1 1/2" square x 1/8" and 2"x1"x1/8". The reason for the aluminum is the top is lighter and removable and still very strong. I have built several racks and it seems every pickup is different and the best way would be to build a jig if you are doing more than one. I carry more steel than ladders so I wanted the base frame to be strong enough to carry some weight.