Okay, folks, voting is open!
I'll close the polls on Wednesday morning GMT.
Lets remind ourselves of what happened...
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 MOUNT ZOOM = Stone Troll made into wheel

 Bag-Endless-fule = Fixed by magic

 Orth-Tank = The Beatles lend a hand. 

 Barad-Dash =  Slaves used as wheel

 Medel-zoom = Golden wheels!

 Minas Mor-go = They are flying! 

 Minas Taxi = Porcupines defeated by... cows?
***
Good luck everyone. By the way... if you win this challenge, you will avoid any bonuses that may be ahead... Just thought I'd let you know...