Order NOW


You can order either DVD or VHS tape for $12, shipping included
(Please specify DVD or tape when ordering)

Send check or money order to:

PO Box 4535
Riverside, CA 92514

or contact Toby Maki at: tmaki@pe.net

You will be amazed at how much you get from watching Duane doing the preventative maintenance live on video. He has so many hints during the presentation that are just not covered in the printed version. This is very useful.


Duane Simmons has hosted a lot of technical seminars on various GMC related subjects over the years. Here are few of them for your perusal.

Onan Control Board Operation

Interactive Trouble Shooting Guide
Just fill out, save, and email

Onan 2004 Demo Pamphlet

Air Suspension Systems

What Every GMC Owner Should Know

Ignition System