HELP 1972 GMC Sierra Grande Camper Special

[paintlover70]

I hope that someone can help me.

I own a 1972 3/4 Sierra Grande GMC Camper Special.
It has a 402/400
A/T, P/S, P/B, T/W, A/C (not working), Dual Fuel Tanks (factory), dual batteries, 4 core radiator, Tach Dash, wood grain interior, extra long bed (9 feet), Barden Bumper which extends out.

This truck is loaded to the hilt.

What I am trying to find out is how much this truck could be worth.
What is the low end and high end of the truck.
It is not in perfect shape by no means.

Any information that I have been able to find out about this year truck has been on the Sierra Grande only. Not about the Camper Special.

If anyone has any information that you can pass along that would be great.