I get/give plenty of waves, mostly with other '67-'72 GM owners...at the least, I try for eye contact...
It does seem to be a bit of an old GM thing, though (not sure, since there's hardly anything else around here that's both restored and not GM!!!)
I agree on the wanting to wave...any time I see one of these trucks when I'm not in mine...hehe....
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Project 1970 - soon to be seen at
http://milhouse.treylis.org:81/