A lot has to do with how solid the truck is! Does it have all the sheet metal? Condition of what chrome and glass (windows) is on the truck? I can say no doubt you could easily double what you paid, just need to find the right buyer. I would put it on Ebay with a reserve around $2500, and see what happens. Truck looks pretty solid from the pics, original color as well, which helps in selling older collectibles and projects, cause people dont have to guess on if it had multiple paint jobs or not.
If I didnt have so many projects in waiting I would definately be interested, but I have 2 bikes and a race car to finish.
Good luck on the sell, it wont be easy.