What kind of ATV is best suited for riding up hills. I will have precious cargo so I cannot go balls out and risk rolling it but I will get pretty aggressive trying to ride up steep rocky terrain. I guess my bigest question is will a 4wd be much better? I have a fair amount of experience hitting some crazy hills on 2wd only. Also, I would like to keep the speed down to a minimum so I was thinking a 4 stroke might help. Am I way off? I want to buy a good condition used quad. Any feedback will be appreciated. Thanks!