I got here too late,I wanted to be the first to comment on that old Bighorn,as much as I love Macks,that Dodge was a beauty and being a Mopar man I just can't let go.Those interior shots of the B61 had the dashboard factory colors that the Macks of that era shipped with.Those old Macks were hot pulling a long hill with a load,we used to just pull out the throttle,open the door and get out on the fuel tank/running board? to get whatever air we could during the climb.It was even worse for the passenger "if you had one" because the stack was right there to roast you even more.
Those Mack quarry trucks were neat too,New Haven Trap Rock had them along with their Eucs so I saw them often while hauling out of their quarrys.Ron G