I have an 86 Dodge Ram D100 Short Box. My Grandma left it to me with less then 100,000km on it. Nonetheless it has had a tough life vandalism, multiple bumps and scrapes and 25 rough Edmonton winters left the body scarred. I brought it to Vancouver, fixed it up and take loving care of it.

Unfortunately rust has started to make an appearance, does anyone know a good source of rear panels for the vehicle?

 

That is a great picture. The truck looks nicer than you are describing. I would start by looking in junkyards for body panels, check craigslist, all the usual used venues.

If you can't find anything there, this place has lots of patch/replacement panels for these old trucks.
http://c2cfabrication.com/store/inde...cPath=1_29_203