Man what I wouldnt' give to be offroad in a 4x4 in Idaho this time of the year or the next couple months. It would have to be, IMO, in the top three most beautiful states.
As far as the differences in yrs. on the GMC's, I won't touch other than saying a 72 will be different in that it will be the only year that has plastic molded door panels and a windshield mounted rearview mirror.
In my opinion, as long as all the rubber around the door is new or in good shape,the doors seal up fine+the fact that the heaters in these truck do a good job heating up the place.
If it is in the condition you say it is, the $4000 seems like a very good price to me. However, to keep it rust free, I hope you intend on parking it this winter.
