according to an article in vintage truck (this debate has been going on for a while) there are no actual laws against split wheels or lock ring wheels some companys or their insurance carriers may prohibt them. check with some companies that specialize in truck and farm tires. I have 3 piece spilt lock wheels and did them myself. 8.25 were the maximum i would attempt on that width wheel. there are vendors selling 7.50X20 such as miller tire, coker tire. tucker tire but they are more expensive than 8.25