OK, my wild guess...
A British 6-pounder anti-tank gun Mk IV. This was the airborne version of the British 6-pounder. This would work for BOTH the Brits and the Yanks as the US Army had replaced the 37mm gun with a licensed-produce 6-pounder, the 57mm AT gun M1 (M1A1, etc..). The US airborne divisions in England traded their US 57mm's in for British 6-pounders on the airborne carriage as the fit into glider better than the wider standard towed mount 6-pounder/57mm guns. These British guns show up in several photos of US airborne troops in Normandy.
Second guess would be the classic US jeep. Again, an item that was used in many roles by Allied airborne units (including towing the above AT gun!)
Third choice is the US 75mm pack howitzer M8. Here we have a US gun that was shared with the British airborne in Europe.
So far Gunn has done some really nice Kraut artillery, so I think it's a gun versus a "vehicle". Just my opinion!
US airborne divisions didn't have many other types of vehicle that they could take on an airborne operation. There were hand carts (M3-series) that were used for ammo and supply hauling.
Gary B.