This was not my idea, rather a local friend (Jeremy) whom had done it to his van, and even gave
me the plastic contact tape to do it.

https://picasaweb.google.com/mtbiker62/SliderQuietening#

The combination of putting B-Quiet on the inside of the slider and on that outside cover panel that covers
the hinge, and adding the plastic tape to the slider path, upper and lower, has made for a very quiet, smooth
operation. 

I've put the B-Quiet on all the door inside surfaces now, and the large body panels, and it has made a very
noticeable difference in the "sound" of the van.
bob