Remember these

I drove a 1971 freightliner like that. The dual air intakes above the grill were like that for a number of years.

 

Waffle plate not bingo...

 

Yeah we called them a bingo plate also but I know what you mean.

 

There's a late 80's S10 parked next to it.

 

That S-10 body and grill was 86 to 92, the new' gen pickup came put in 93 and the blazer/jimmy re-do was released in 94

 

So picture wasn't taken mid 70's.

 

Never heard of a flux capacitor.... smh

 

Bingo card was carried in the cab, had the carriers name typed on it who you were leased or trip leased to at the time. Had postage stamp sized state stickers on it, more of an authority, puc permit than anything else. You could easily heat one side of the card with a cigarette lighter, and peel stickers off for another card if you were missing them.
Waffle plate was a gridded steel plate that went on front of tractor and rear of trailer, for small stickers with reciprocity apportionment state stickers. More western states used these.
Fuel and use stickers went on the side of the cab, some on the windshield. Some states used one, some on both sides. And they all had a place they were supposed to be.
Some states required fuel and use plates, mostly on the front, but in the old days , 8 or 9 plates on my front bumper, 4 on my trailer, and a couple behind the passenger seat, for states I rarely went to.
One of the greatest improvements in trucking (besides tubeless tires) was IFTA and IRP. Before that you had stickers and plates, cards, permits and you still really never knew if you were completely legal. When I was leased to CF, our permit book was as big as the NYC telephone directory. All about the money.
Picture of my old fuel sticker plate, back from when the states were finally getting away from all that crap, took a while to get all the states on board.

 

@DougA is spot on. Here's another peak at what they looked like.