Let me try to clear up any confusion on my Jeep
FS means full size Jeep, made by AMC. It's nothing like the Jeeps made today. It is between the size of a Durango and a Suburban and has a 5.9L V8 (360). Here is a photo of my Jeep in Colorado:
http://www.dynamic-arts.com/jeep.nsf/P7170078s.jpg
The Jeep dealership actually told me 6000# towing. My friend has an old 23' box travel trailer that I weighed down with sound equipment and pulled back and forth from Cincinnati to Columbus. It did fine towing the load, but the temperature would consistently rise 20 degrees on the long steep hills. I figured in real mountains it would be working pretty hard. After talking to the guys on the FS Jeep board the general consensus was 5500. If I can get my total load under 4000Lb I'd be real happy.
As an alternative, I also have a Jeep J20. It's a 3/4 ton truck like the one parked behind my Jeep in the photo. It can tow 8500. I just don't have it set up for towing (no hitch, wires)
How much should a 1972 25' A/S weigh?