why u want to put it in the Base sector? its a mobile truck
For the same reason you put your ambulance on your HQ and not in the front.
For the same reason you put a medic bunker in your base and not in the front.
If someone deploys any building outside their base layout, that's on them if they get destroyed.
Take Faymoville Approach as an example. You don't need to have 200 IQ levels to know how easy is to snipe the USF ambulance. Specially when there is no shotblocker in the front of the base and your HQ covers the whole area.
Ex:
https://www.youtube.com/watch?v=fg4AwehP_QM
Not sure if there is a snipe ambulance here, but just check how much the USF base cover and how unprotected it is, even been able to hit it from the strategic point in front of the base.