Khurasan Miniatures have posted a photo of the 3D sculpt as well as details of their upcoming 15mm Atlas Class APM vehicle.
From their website:
This heavily armoured tractor is armed with a rotary cannon mounted in a turret, but its primary use is to carry a variety of payloads into action, including the APT (armoured personnel trailer), as well as the JUGC (joint use gun carriage), which will have a mount for an AAA suite, a heavy artillery piece, and an MLRS.
Also planned is a dropfit guntruck rear that will carry several men and lots of guns for patrol purposes. This won’t be a trailer, it will be a direct attachment to the back of the APM.