Hand Drawn Carts...
Ok say you got some supplies that a person building their own town really needs but your inventory space is too small and it would take multiple trips, you can make a Hand Drawn Cart that can carry other players or chests but not at the same time.
The person actually pulling the cart cannot attack enemies, but the cart can be stopped to act as a supply post and re-picked up. This will be EXTREMELY useful if a town has a mine or logging base set up far away and they need a constant need of supplies, or if some players need safe passage to another town or area.
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Dustin Stone commented
see its a good idea... if minecraft didnt already do it