Here is a link to truck wiring diagrams. If you need the rear portion of the Burb, then Pauls suggestion is the best bet. The front part of the Burb is like the trucks.
http://www.geocities.com/chevroletc1070/wiringdias.html
Jim
PS:
Shev, we are glad to see you on the board. These Burbs are great and you put a lot of usefull stuff on your web site.