You can get a cow-drawn wagon/caravan and can build on it. So you could place chests, or possibly make a new Seat block for passengers, or make a siege tower. It would make battles more epic, traders/barterers lives' easier and look cool. And you get the cow by using wheat to lure him to the caravan, and then place it in the front. Then he basically attaches himself. You can also steer it and move at a normal walking pace. And maybe it can go up/down 1 block height safely.
Why does everyone think I don't have an avatar? Is there anyone who can see the one black pixel.
"Hmm?"
"Two block high hill"
"RAGE"
"I will get out and fix it..."
Ssssssssss...
But seriously, no support, simply because we do not need vehicles. This would make a fantastic mod, however.