Cannon,

Here is an excellent introduction to wheels (by Grigg).. You might have already read this Tech Tip.

The original 20" (9.0 width) split wheels/rims on my 2-ton GMC COE caused no fears/problems for the local Goodyear Truck Dealer/Seller. The metal in the "halves" and locking-rings were in excellent condition, and had been recently powder-coated. He used new tubes/stems that I bought on-line (and Samson tires).