Looking to buy a new Yukon XL and getting poor advice form dealers (and ZERO advice form GMC support). We have a drive on beach with very deep sand on occasion. In the winter/Spring we will be using it in Vermont with 6 inch+ depth mud on the roads. The dealers are just trying to tell me the stock 22's will be fine but I know they won't. My current 4Runner has 18in rims and the off-road tires have an AR of 70. Can anyone recommend a combo of stock rims/tires from GMC I could request?