Jerry:

I tried the only big truck shop in town a couple of weeks ago. They said they knew how to bend the axle, but their alignment testing equipment was physically to large to fit my small truck.

I've done caster shims on my '57 half ton in the far past. Got them at an offroad truck store. Had to make them narrower and not quite as long, but that was easily done with a hack saw. Should be the same on this truck.

'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.