The Thunderhawk Transporter is a logistical variant of the standard Thunderhawk gunship used by the Adeptus Astartes to carry Space Marine vehicles into combat zones. The Thunderhawk Transporter, while lacking the firepower of the standard Thunderhawk, is no less important to an Astartes Chapter. The Thunderhawk Transporter can quickly load up to two Rhino sized vehicles of any type, or as seen here (hiding underneath), a single Land Raider sized vehicle.
This Thunderhawk Transport was part of a airbase diorama at Warhammer World where there were all the different kinds of Space Marine Flyers, complete with marching squads of Space Marines and Space Marine armoured vehicles.
There were some nice touches such as armed guards surround the flyers and ammo supply vehicles getting in close to rearm the transports.