1991 GMC Topkick
84,000 miles
Cat 3116 Engine
Five speed Eaton transmission.
10 foot dump bed
26,000 GVWR
16 foot knuckle boom. We used it to lift 3000# pallets out of the back.  I was told it will lift 6000 pounds when I purchased the knuckleboom 3 years ago. 
New rear brakes, new clutch, pressure plate, resurfaced flywheel, New PTO shaft. New thermostat, new fan clutch, replaced all but two hydraulic lines on the knuckle boom.
Will need front brake pads in the near future. Tires still have some life in them. 
The truck runs great. I would be willing to separate the knuckle boom from the truck.
Asking $7,000