Is this a good deal ? Work truck/tow rig

http://sanantonio.craigslist.org/cto/3835438478.html

Not up to date on the older Cummins setups but given what newer stuff is going for, is this a decent deal ? What should I watch out for if I go look at it ?

I'm wanting to ditch a 16' box truck for something more versatile (sp?)