When I was a kid, the local blcksmith was considered a God of some sort by many local farmers. If a piece of farm machinery broke, it was of course while the farmer was using it and needed it right away to finish his field work. the blacksmith was the go-to guy. Most of them did not have engineering degees or a lot of formal schooling, but they knew IRON. they could fix anything iron. Usually, the solution was to weld the broken part, then lay a piece of iron about twice as thick over the break, and weld the hell out of it. If a good blacksmith fixed something, it never broke in THAT place ever again. same think here, cut it, bevel it, weld it with your favorite rod, then lay more iron over it. keep it straight, remember, if you are going to open up that belly tanker for all its worth, you want most of the wheels going the same direction!!