The can safes are ideal whenever there is no suitable space for a built-in safe. The money can then be hidden unobtrusively in a mobile safe between the supplies.
Dose safes or kitchen safes are usually big enough for money bills and an ID. They are unobtrusively stowed between the supplies or the tools.
TIP: Also fill the can safe with a heavy object, so that the weight corresponds to that of a normal can.
The mobile safe has the advantage that the holder is firmly connected to the vehicle, theft is difficult.