M.A.S.K. stood for Mobile Armored Strike Kommand.
The Rhino was a tractor-trailer/mobile strike center for MASK. It featured a Battering Ram Bumper, Smokestack Cannons, Ejector Seat, Rocket Launcer, ATV and radar dish. Matt Trakker and Bruce Sato were the drivers of the Rhino.
The Rhino came with figures w/masks, vehicles with accessories, mini-comic, poster and instructions for transformation.
Note: The version of Matt Trakker that comes with the Rhino is different than the one that comes with the Thunderhawk.