I put a set of Essex 27" 589's with Kevalar Belts on my RTV. They look and work great. I added a 1 5/8" lift kit at the same time. Stock wheels work fine. Going through mud is great. I think you lose a little in pulling power and since my property is just about mud free these days, I have removed the 589's and gone back to 25" off road that came with my unit. If you are interested I have a set in my barn I'll sell for $200 (Cost $400) They are like new and no holes or leaks. I attached a picture so you can see what it looks like with lift and 27" 589's
PM me if interested.
Thanks,