http://www.dakkadakka.com/dakkaforum/posts/list/93.page JForum - http://www.jforum.net http://www.dakkadakka.com/dakkaforum/posts/preList/339166/2317890.page http://www.dakkadakka.com/dakkaforum/posts/preList/339166/2317890.page GMT FAQ holds the answers you seek:

“The Doomwheel has the Random Movement special rule,
with the following exceptions.
• If the move takes it into a friendly unit, the creature will
inflict D6+1 S6 Hits, distributed in the same manner as
shooting attacks, and then stop 1" away from the unit (or flee
through it if it is fleeing).”
• The Doomwheel treats terrain in the same manner as a
Chariot.”
Note that the ‘Loss of Control’ rule remains unchanged.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/339166/2318115.page http://www.dakkadakka.com/dakkaforum/posts/preList/339166/2318115.page GMT