I'm amazed that the curtains are still intact, and look to be in good shape. They usually faded quickly and became so brittle they'd just fall apart after just a few years. The B2's tinted side glass helped, I'm sure, but even the paint looks to be good. I don't think that this truck sat out in the sun much over the years.
If given a good detailing, paint polish, buffing and wax, I'd bet this truck would really be a looker.
The seats look stock, as the center console, but the overhead console, CB and dome light are aftermarket. Also looks to have a old-school fender-key alarm. No visible dash cracks, and still has the stock radio. Upholstery, including headliner, looks to be in great shape.
The "cautions". It has an A4LD (the broken shifter handle is in the passenger seat) and the 2.9 with the earlier heads. With an ATF bottle and antifreeze jug being in the back, it'd be good idea to check the oil filler cap for "snot" and make sure the engine cooling system is in top shape. I hope the tranny is still all there, and that it has an external ATF cooler.
At the time, a Zimmer was considered the "Cadillac" of conversions. If I came across this truck, I'd buy it in a heartbeat at a reasonable asking price.