Just on a very slight tangent. All that plastic in the back of the sprinter can be made quiet by taking it all out and placing rubber (I used old bike inner tubes) gaskets as it were on all the mounting points - especially the one's that are only held by those plastic clips.
I also used stick-on felt strips along certain edges so you would not get that annoying plastic on metal buzz.
Wrinkled the roof - stuff imagine what it did to the new load you were brewing up in your pants, bent sperm!!