I've just released another 3D printable 28mm scale vehicle on DriveThruRPG:
https://www.drivethrurpg.com/browse/pub/13766/Tabletop-TerrainThis is a Military transport designed to fit into SciFi and Post Apoc settings. It's inspired by the classic 60's British Alvis Stalwart. The kit prints in parts on consumer FDM printers like the Creality Ender 3. That's a Pig Iron Productions mini catching a ride too btw. The parts in this kit also work with our other vehicle kits on DriveThru, which gives you variety of vehicles to build.
It also includes hinged, drop down sides.