Too much on the to-do list today to get these on a machine but did manage to drill the rims for the weights. ICYMI, these 4 x 8 rims came on an off-brand cart with bushings and dry rotted wheel barrow tires. I almost threw them on the I don't care pile but they're actually decent quality so I knocked the bushings out and put 4 ply 4 x 8 tri-ribs on them.
I talked my brother out of the weights and cleaned them up. Too wide on standard rims to get through the gates on my property so I think this will work. Soon to be in service...