These are still signifigantly smaller than the semis, but they aren't exactly *tiny*. If i park my real cars next to a semi and step back they look small too.
I'll call that size proportional, VW pretty strict 1/14 of real. Tamiya likes more around a vague 1/13.5 on their trucks, and i think the MAN Kat 7.5 ton i'm next to is more 1/12
This Dodge Tradesman shorty without any bumpers or grill is 12" (305mm) long by 5 5/8" (142mm) wide, 5 3/8" (136mm) tall on those cut lego tires, as fully laid-out as i can manage
The dickie VW bays are 12 3/8" (314mm) long, by 4 7/8" (123mm) wide, 6" (152mm) tall at the racks. On either stock or 1/24 semi tires.