Man, you are entering into a hot topic:gunt:
If that D was at Copley Motors they would be asking much more than that.
www.copleymotorcars.com
Scott hit it on the head that the reason they are expensive is because they are a bit harder to get than a Jeep or Toyota, and since the newest NAS truck is now 10 years old, they are harder to find clean examples. If your buddies D has been maintained and is well cared for, it may be worth it to you. I've heard that the lower mileage trucks are not the best ones mechanically as they like to be driven and not sit around. 30K sounds a little high, but maybe by only 10 to 15%. I would say it really boils down to how good of shape it is in and what the PO has done. My PO was pretty meticulous, but I've still had to work through some problems with mine.
I came over to the dark side (pun intended with the Lucas Electronice

from having owned 4 Cruisers. It's not an easy transition as there is nothing more reliable than a Cruiser, but man, I think the D's are way sexier:26_34_3: