I cureently ride a DRZ400S and after about 20 minutes of sitting while on the road, my back starts hurting. I end up having to stand up for several miles for some relief. Does anyone else have this problem? If I bought a V-Strom, would I have this problem? I need something to rest my back against and thought maybe I can get a custom seat with a backrest. Any advice or opinions would be greatly appreciated. Thanks.