Kato already answered the recon question.Wouldn't it be a case of specialization? I.e. a smaller crew of professional maintenance personnel who have little to do with tactical operations but can help with the general maintenance you've described?
EDIT: What about organically integrating UAVs into the force-orgs of arty btlns? I guess I should ask a broader question about dedicated recon assets for arty units in Germany.
As for dedicated maintenance personal. One already has that in the maintenance part of the 1st company and independent maintenance units. But these specialists are a waste to use fir the more menial tasks of heavy vehicle maintenance.
And these maintenance occassions not only happen to be done in technical areas of barrcks but as you know in the middle of the field.
And everytime that happens as well as everytime the is a need for additional security, watchkeepers, etc. you have to shift these extra warm bodies around. All the while artillery units operate more and more dispersed as a precaution against counterfire.
Additionally with very small crews you have no way of coping with crew attrition be it due to illness, accidents and casualties. Most current SPGs, MBTs and IFVs can be operated by reduced crews. Vehicles with really small crews cannot.