I've had a bentley manual since not long after I bought my 90 new.
Recently, a previous owner of my diesel 83 westy tracked me down to
give me the original manuals and a bentley that only goes through the
1995 model year. I have only had a few moments to look at it, but just
flipping through I can see a LOT more detail in the older book on the
camping stuff. I guess they pulled out a lot to include all the 2.1
stuff in order to keep the books about the same size, which they seem
to have done.

Just thought I'd mention it in case you don't find it in the later
book, it may be in the earlier if it pertains to all models or earlier
models.

Jim