Animal Transport

[Devonfarmer]

As I have never tried to start modding I would like to ask the assistance of an experienced modder to make a couple of items for transporting animals. The first being a 6 wheeled lorry with double decks in it for all animals and the second would be a trailer attachment with an animal box on it. Reasons being all animal transport is unrealistic on the game as a the largest animal trailer should be able to take 40 cows 100 pigs and 150 sheep in real life. Any help or advice would be appreciated.