This guy has a ton of files and they will also need some sizing... plus these are both a little more than scale3drc....
https://cults3d.com/en/users/hora80/creations
And this guy he has a B series Mack and a Chevy C70 I haven't printed them yet but...
and the same applies you need to do some sizing....
https://cults3d.com/en/users/LaythJawad/creations
Hope you don't mind me adding these on Frizz...