Based on this picture you provided here, it is too far away to determine which marquee this is. Script and grille style are usually stand difference between Chevrolet and GMC.

rjluna2 -- you might be correct. Do you know if there's a way to determine whether it's a Chevrolet G-Series or a GMC G-Series?

That's a Chevy/GMC Van

I'm not sure, but surly looks like GM based G-Series to me

I think the Buick LeSabre was one of the "standard" picture cars The Burbank Studios (now Warner Bros.) used as background cars during that era. Thanks for identifying.

Any thoughts on the ambulance in the first picture?
I was thinking of a customized Ford Club Wagon or a customized 1983 Ford Econoline 350, but I'm not sure. I'm trying it with another angle that shows the whole ambulance here:

The car in the middle picture is a 71-73 Buick Lesabre.

Thank you so much!

The tanker in the 1st picture is a Kenworth C500, unsure of year but 1980s due to square headlights. Ambulance in second picture is a 1975-1978 Dodge Van, the fire truck in the last picture is an 81-88 Chevy/GMC.

Fire Engine:

Ambulance # 2: