It has always bugged me that in UFO there is a Xcomutil option to make the Interceptors into mini-transports, but there has never been anything like that for TftD.
Since I've had some time on my hands recently, I decided to have a go at makeing a copy for the Baracuda and Manta.
The Baracuda can transport up to six troops, and to represent the fact its a small craft, has a limit of 50 items.
The Manta can transport up to eight troops (including one tank), and like the Baracuda is a small(ish) craft, and so has a limit of 65 items.
I am sorry about the low graphics quality, but if someone wants to lend a hand, send me a message.
If there are any problems with the files/maps ect. please post info and pictures so I can fix it.