If thats what you are looking for, then I would jump on it. I really don't think $5000 is far out of line for a clean well maintained truck with a good body. Not many 2wd here, but 4wd usually go for a MINUMIN of $7000 and thats farm truck bodies. I wouldn't sweat the auto, just plan on prolly having to do something about it, and plan on spending half of what you paid for the truck on the transmission. I too am a firm believer in 5spd's but with watching what some guys do to autos now I wouldn't be afraid of it.
I just picked up a '90 W250 w 727 and 3:55's. Body is VERY rough, ie farm truck, and with 160,000 miles, original transmission for $2500. I am SURE I got a good deal, BUT I bought this from a friend and he wanted me to have the truck, so this price is not a good comparison.