As stated above, almost always advertised out of San Diego.
Almost always a high mileage 7.3l diesel.
Every one I've ever seen has the same smaller tube hoop steps like the van in the link and the bumpers/racks are often the same material and similar.
another trend I've noticed is they are often less desirable vans than most of us would pick for conversions, such as passenger vans and base model vans with worn interiors.
None of these telltales jump out as a Crows for sure except maybe the metal fab but 2-3 of these or all of em pretty much nail it every time.