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...