You know I went hunting last month, when I left the bike was setting at 12" front to rear, two days of hunting and the rear was setting at 6" and the front at 11.5" with 600 LBS in the bike. I come home and looked at the rear after cleaning it up and couldn't find a thing wrong, I put a strongarm lift on the rear ( set on 3" lift ) that leveled it out. now I've been talking to a friend that has a viking and he is looking into having a spring made for rear of his.