@ Lemontree - you brought up a good idea on Discord..
Can I make a Flier land and become a regular "moving" vehicle?
I know we do this for both Thunderhawks in DA and Stormravens in UM but they are stationary when they land so I cannot at all imagine if we allowed it too move on the ground why it would not then be treated as a standard ground vehicle?
Did you ever see if it did work using that logic (ie. entrench_ext)?