Randy, the chances of finding a welding shop that will modify an existing hitch to increase the capacity are very slim. It's a liability issue for them. Your best bet is to go to a reputable hitch shop and have them remove the present hitch and install a 10K hitch, if the frame will support it. Just welding gussets on your hitch not really add much capacity. The 15K hitch on my truck uses a 2 1/2" reciever and ball mount, the ball mount is a solid piece of steel, not a holle square tube, and uses a 2 5/16" ball.