Pick the same points on each side and measure the body to the floor. This should tell you if one side is lower. We never apply a strap across the body for this reason. It can cause the body to sag. Temperature and time can help this occur.
Lewis
Life should not be a journey to the grave with the intention of arriving safely in an attractive and well-preserved body, but rather to skid in sideways , cigar in one hand, whiskey in the other, body thoroughly used up, totally worn out and screaming "WOO-HOO, what a ride!!!"