Well I checked with Ken Jones Tire in Pa., their version is called either single or double diamond chains, which refers to either 1 or 2 studs welded to the links. Single diamonds are approximately $590- $600 for the 420/70-24 R4's that I have. In light of the comments fielded by gerard and Boondox, I think that I will be going with the regular duo- grips and my soon to be loaded rear tires. If I need some additional weight, I have some ideas for a couple of different ways to add weight to my rear blade. Thanks Boondox, Thomas, Kodiak, and gerard.... All I need to do is figure out how to persuade the wife how nice a new L series Kubota would be in our garage. ( The 3010 hst only has 105 hours on it now).