Tracker is great to see how long they have been at the property and proof that the van has been in a customers drive etc.
Dash cam would only really be good for accidents .
Can you get continuous monitoring cameras that back up to a hard drive stored in the van somewhere. Bit like a onboard CCTV I suppose.
Me, as it's just myself I have a tracker on my phone which has come in handy 3 times now,
Customers questioning if I have been. when I say I'll check the tracker for the times they soon say they could tell I've been a were just curious