I am more surprised that the 100 that you have found has rear A/C with cloth. While there have been sporadic "poverty pack" (hard to type that about a truck that was still prolly $50k in 1999) sightings here, I cannot remember one with rear A/C.
$6400 is a killer buy in price. Provided reconditioning is under $1500, I would think it is gonna be real tough to beat for a rust free CA truck. Another cool thing is the ODO can be switched from the actual mileage to one of the 2 trip computer mileage modes...