Sorry I haven't posted in a while. I took off the wheels and had the tires de-mounted. One was so bad that it took three guys and three pry bars and a can of spray lubricant to get it off the rim. Needless to say, the inside of the rims had lots of flaking rust and I wire wheeled them alot. One rim had rusted through pretty bad around the valve stem hole. I asked a neighbor if he could fill it in with some metal pieces and braze it. He wanted to charge $60.00 per hour and it would take about 1.5 hours. Ouch.
So instead of going that route, I got some J.B. Weld and did it myself. Turned out better than I expected. Saved money that could otherwise be spent on paint and grease for the axles and rims.
Inside one of the rims there was some paint that said "40 CHEV". I suppose the rims could have come from an old chevy because there were extra spoke holes around the rim. Smaller holes than the metal spokes that are currently used. I think that someone used old wagon wheels and different rims and welded them together... However, inside of one of the rims I noticed a stamping in the metal that said "Made in U.S.A. by Motor Wheel Co." There is also a stamping that has numbers "16, 100 or 400, and 576." I guess the 16 could mean the rim size as there were 16" tires on it. I will post pics later when I get them transfered to my computer.
I used an old tractor inner tube and cut strips to put around the inside of the rims to help keep moisture from weeping through the extra spoke holes. I am going to paint the rims white and the caps red. I am also going to paint the rest of the wagon red for a Farmall...IH theme. I will pull the wagon with my '51Farmall Super C which I am continuing to fix up. It is mechanically sound, just needs lots of wire brushing and painting.