Sprint, Try reading my post again. I was not asking about the OP's motives for wanting to install duals. I was asking about the rationale behind adding duals and my 2nd post should have clarified my intent. If the OP wishes to add duals to his tractor, then that is his personal choice. It was not my intent to interfere with that.
Thanks for telling me about the sand trap drag. I did not know that golf courses routinely used garden tractors for this purpose. Does anyone else know of other reasons behind manufacturer's offering dual wheel kits?