Sustained area spells and movement, relative motion and mana manipulation Options

[Suriyel]

In the spell design chapter of MitS (around pg. 53 iirc) it says you can move a sustained area spell as a complex action. It does not go into much detail (or at least detail that I have found) as to whether it is a complex action to move it to a specific spot, or if you can use the complex action to give it continuous motion (until your next action), ie you spend a complex action to keep your domed physical barrier over you as you run. Does anyone know how this is supposed to work?

Also, if you were in a vehicle, and cast a domed barrier spell over the vehicle, would it's motion be relative to you (sticks with the vehicle) or to the surface the vehicle is on (sticks to the ground it was initially cast on)?

Basically, I'm looking to be able to provide some extra protection to our rigger's tricked out van by providing an astral barrier to make opposing mages have to get even luckier to powerbolt it to smithereens and to keep pesky spirits at bay long enough to have time to deal with them. It's unlikely I'll get a spell shield at a high enough force to affect the van directly for quite sometime, and it'd be nice if I could just maintain a barrier spell over it, but its usefulness would diminish if the van had to be stationary to make use of this.