Okay, there are a pair of Chevy Vans that have their weight classes listed as part of their names.
http://www.imcdb.org/vehicles_make-Chevrolet_model-Chevy+Van+G-20.html
http://www.imcdb.org/vehicles_make-Chevrolet_model-Chevy+Van+G-30.html


The way I see it, either all the ones with G-10, G-20, and G-30 designations should have them in the names or they should be in brackets.

http://www.imcdb.org/vehicles_make-Chevrolet_model-Chevy+Van.html