Please disregard my post dated 8/6/09, I used the word "drop" wrong
When I used the word "drop" it was in a positive way, other car wash brands, after the pick up cabin roof is cleared by the roof brush, the roof brush stays at that height, it does not lower; the Mark VII machines contour the cabin, washing the windshield, roof and back window; the machine is intelligent to know if the pick up bed has a cover or not and the roof brush applies the correct amount "pressure".
Sorry for the confusion.
Thanks