i do a lot of trail riding as well but i still went wider, you just have to pay more attention to the trail. so i would go with a +2 a arm and then you will need to get new shock re-valved for the new a arms. you can get wickeds a arms for under $400 and look for some shock on ebay or you can go the route I went and do a yfz 450 a arm conversion it only cost me $150 after i sold my old parts but thats with out the yfz 450 spindles and brake MUCH CHEAPER