A simple way to increase security of your bikes which these days could have values of many thousands of pounds.
As well as all the locks on the bike i then disconnect the electric hookup cable (from the power end) and thread it through the frame of the bikes and then reconnect the power.
I bought a power cut alarm from eBay (about £6) which i plug into a socket inside the van so if the power cable is disconnected or cut through (if any would be thief dare!!) then a loud alarm sounds in the van. In fact it’s so loud it can be heard outside as well.