User blog comment:RemosPendragon/Chapter size/@comment-8395098-20150201151004/@comment-8395098-20150201233410

^That makes a lot of sense putting servitors in their tanks, the admech does the exact same thing with a good number of their vehicles Reverse Titan's have a crew of 4, but a dozen servitors, their tanks are almost fully automated driven by cogitators and commanded/operated by a war-priest.

Adeptus Astartes could easily do similar if not the same, otherwise TechMarines are almost exclusively doing work Serfs with a engineseer could do or basically acting as a Exploritor bit for the SM.