Based on what I have observed in salvage yards I would go with a Chevy.

A lot of people in Oklahoma drive trucks and full sized vans. In the salvage yards are a lot of Dodges, a lot of Fords, and only a few Chevy's. There are more Chevy trucks than van, of course, because there are more of them sold new.

But the data holds true in Oklahoma and Texas. If you are looking for parts for a full sized Chevy van then you will have to look hard. You just don't see many of them in the yards.

(This is not true with Astro vans. They were everywhere at one time but most of them died off long ago.)

A 3/4 or one-ton long wheelbase will hold a lot of stuff.