The only aircraft even remotely capable of carrying a tank was the Messerschmitt 323 Gigant, and that was usually limited to a Panzer I/II type. It couldn't carry a Panzer III or IV, so that rules that out completely. Six engines, damn near impossible to fly, and if you think Goons are cannon-fodder, imagine something the size of a modern-day airliner lumbering along NOE at 120 knots.
If you want the ability to move large amounts of supplies, vehicles, etc., your only historically accurate option is a freighter or landing craft, LCT, LST, LCV, etc.
It's great that people are excited and come up with new ideas, but I think folks should research their requests thoroughly and suggest things that will fit into the parameters of the game, not just locally, but globally, and then formulate the need for a new type of vehicle. If there's something already in the game that can do the job, why replicate and reinvent the wheel? This involves either knowing WW2 military technology and history, or researching it.
Just my opinion...
J