Would be nice to know what the price is. Im kinda in your area (5hrs east) and I would value the truck at $7-$8000
IFFFF its walker beam suspension, in good condition
IFFFF the bed is in good condition
IFFFF the tires and brakes are good
Is tranny in good condition and what kind is it 9 speed 10 speed, more than likely a 13 speed
Interior condition
A/C??
If its a road tractor conversion its not worth that much
If its air ride and you are going off road, stay away from it
As far as 400,000 miles, needing a engine rebuild shortly, Ive had Cummins 350 that had over 700,000 before any major rebuild. These are great engines and you can rebuild them for about $2500 aftermarket parts, plus labor
I own two trucks, with this same engine and they are good trucks, not a big power house, but gets the job done
Let us know what you find out
check Craigslist in you area, a friend of mine just bought a 1992 KW T800 dump, from your area for $9000. He drove it home and put it to work the next day
any truck will nickel and dime you, so always be prepared, know what you are buying