When I upgraded, I wanted the same thing. So ended up with a 6 ply tread and went ahead with new Alum wheels to help keep unsprung weight down. Forget the brand, but it's tread pattern is an angled series of bars like a UTV tire, works great. Had em add in slime and mount the wheels, was just over $600. On on-line speciality place, are several to choose from. I can check the brand/model if you like.