720/Powermax Ag tires

[npalen 2]

Wondering if anyone might know of a source of lugged tires in the range of 20" diameter 6-bolt rim? I like the lugged tires but the 8.00x16's on my 720 are a little small with approx. 30" rolling radius. There's plenty of room under the fenders and the tractor frame actually looks like it's tilted to the rear with the heavy duty loader tires on the front. Probably could make some custom wheels but would rather avoid if possible.