We were towing the 5er this weekend and I was on some pot-holed roads for a while and I noticed that the drivers door seemed like it wasn't latched tight. It kinda rattled up and down a bit, looking at the window area, and was making a noise like it wasn't closed tight. I'm not overweight but right at max gcvw.
Any Ideas? Frame flexing a bit?
Doesn't do that empty.