The banging had nothing to do with the suspension. It was associated with the TSB Klaus posted here:
http://elcova.com/groupee/forums?a=tpc&s=2826088551&f=6706011751&m=381104074 &r=673104284#673104284
It's the first TSB Klaus posted. I picked it up and was driving down the highway and the noise was worse, so I turned around and went back. The tech and I then rode down the street and he heard again. We get back and he shows me what it is. On the driver's side there is inner sheet metal and outer sheet metal making up the fender where the battery is. The TSB says to dimple the inner fender and he did that but it made it worse. There is a hole on the outer panel that he also had to "dimple".