@ATFGunrthe OP spoke about using the Mortar, that puts him pretty close to enemies.
So this is most likely not a camping in base situation. Its more a placing a MAV behind concrete blocks while attacking A1 on Exposure during Breakthrough situation. This would safe every player 200-300m running across much cover who spawns on the MAV.
Sure taking the MAV on a ride around the container so that everY M5 easily can hit the transport, offers the opportunity to spawn even closer to the objective, for maybe 15-20s.