The phrase "size vans" refers to the different categories or types of vans based on their dimensions or measurements. It is a way to classify vans based on their size, such as small, medium, or large vans. Full definition
Full sized vans are one of the most versatile car segments around. (thesupercars.org)
Another option first introduced on the vehicle is a rear - view backup camera; widely available on smaller vehicles, it is the first in the full - size van segment. (en.wikipedia.org)
In a complete size van, the lift might be mounted within the side or rear. (automobiles.com)