Kevin:

Crossmember A is only about 1" tall, relatively thin and is mounted to the bottom frame rail. Its purpose is to create a horizontal surface, along with crossmember B, for the stock spare tire to be pushed up against when it is stowed. So crossmember A would need to be extended vertically in order to keep the crank mechanism vertical. I plan that the plate that the crank mechanism will mount on will be made of 1/4" steel and should have no trouble with bending.
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'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.