I just bought Tru Powers for the rear of my super and Vredestien v61's for the front. I bought them from "Miller Tire". Great people to deal with. I'm with Murphy on the weight. The more the better. I'll be loading mine soon with liquid, Probably "rim guard". I just had to paint my rusty rims. I mounted mine myself but it's a chore.
Here is the only pic I have at the moment because my tractor is apart.
http://www.millertire.com/