Until the Rigger book comes out (whose coming is also coincidentally a sign of the approaching Apocalypse or 6th Edition) I would go with Pg 134 in Arsenal which covers drone racks
Drone Rack (Standard): Drone racks are a convenient
way of carrying your drones around so they’ll be available when
you need them. Standard racks allow fast drone disembarkation,
while the special landing racks also allow a quick re-embarkation
of the deployed drones. Being equipped with a number of
drone racks turns a vehicle into a highly effective drone carrier.
So you don't absolutely
need one to launch a drone from your vehicle, but it does mean if you don't have it you are having to hold it out the window to launch or something similar (pop the trunk maybe) as well as not having a nice easy return, most likely having it dive into your back seat to land, which may irritate the rest of the team sitting back there at the time. Sure you can make it land on top of a vehicle, but without the rack to hold it, what's keeping it from sliding off? (Hint: MegaDuck Tape )
In the case of the Lamprey, this underwater sea sled has a rack which allows for one drone to be easily launched from or docked with it.
