When I worked for Davey tree in Detroit the management did not want you to do any sidework at all, even threating to fire you if you were caught. My foreman would get me to walk through the main office and carry the 084 Stihl past everyone and then put it into his truck for him just to prove the point that they really didn't care. On saturday during some trimming and removals for one of "his customers" he takes off and returns an hour later with a Davey truck and chipper.
My Davey foremen explained to me the "propagation" theory. When you break a willow branch off and stick it into the ground a new willow tree emerges. Same thing happens with Davey tree people. When he quit the following day his tree service was fully supplied with ropes, chainsaws, preformed wraps, cable, etc.
I guess it all depends on your management. Another buddy of mine who works for a very respectable tree service in the Metro Detroit area can take a truck and chipper home on the weekends if he gives the boss $100. They only catch - no company clients.
Wish I could have done that back in the day.
Dave