Here are some pictures of a 16" Doka that I'm currently converting for a customer.

http://www.autostadtwest.com/images/16/16-1.jpg

It's an ex-military vehicle that has some interesting mods.

 - Escape Hatch: http://www.autostadtwest.com/images/16/16-2.jpg

 - Wiring Pass Through: http://www.autostadtwest.com/images/16/16-3.jpg

 - 24 Volt Setup: http://www.autostadtwest.com/images/16/16-4.jpg

It's a normal 12V setup, but the second alternator allows it to produce the 24V required to meet NATO standards.

Cheers, 

Jeff
www.autostadtwest.com