Im pretty sure this has happened to everyone, but you know how when you go over succesive bumps, or peel out. The rear of the truck feels as tho it lifts and get squirly. I know everyone does. Well now you know what im experiencing. This happens alot. Way more than it should. I can be just cruising at 60 on the fwy no lane changing nothing and the back feels squirly. It happens when im going slow as well. It can happen damn enear anytime, accelerating or not. It is driving me crazy. My shocks suck but they arent shot yet (I hope) and this never happened until very recently. My tires are wearing well and show no signs or a wobble or being out of round (as per discount tires say). Could shot spring cause this? Any ideas?