Unfortunately, the switch to operate the platform is at the bottom. The Sackpersons need to use the grabbable wheels to swing down to the switch, and then pull it, bringing the cart the rest of the way.

(PS: Click through to flickr to see the notes on the diagram.)

In an hour we completed both the Ice and Fire Mountain dungeons, learned the fundamentals of Jems (for augmenting items) and Mats/scrolls (for creating items), and killed a Big Spider boss. ^__^