you probably need a lot more forward castor, esp. with that big of tires.
If you don't have enough castor it will be like a shopping cart's wheels.
4-wheeling is about going where others can't won't or don't think it's safe.
Freedom. Exploring the wilderness, or nature, whatever... - NOT paying to go on someone's roller-coaster ride, or go-cart track!
"The price of freedom is eternal vigilance." - Thomas Jefferson