Able to handle dirt roads other than a Sportsmobile.

Since you mentioned 'small', you might also look at the Tiger GT or XL. It looks like a C, but is by definition a B, since GM never made a cutaway Astro van. IIRC, the GT is the pop-up version, the XL the hardtop. They are scarce, and I think the last ones were made in '05 by Provan, which became Tiger Vehicles.

Most were 2WD. Some were GM OEM AWD. A few were converted to full-on 4x4 by a 3rd party.

Here's a pic of one such:

Jim, "Corect speling is for pedents."