Could possibly be considered for commercial vehicles: trucks, lorries, taxis, etc. but there is no way successful retrofitting of private vehicles will be enforceable.
Would consider a Mini or BMW-i when the taxies are dropped significantly. Useful only for a town run-around. Will be adapted to our existing solar system quite easily apparently! Still early days though!
Our local PO Box service was cancelled a year ago (non-payment of building rental by the PO) and taken over by a private enterprise for a higher box rental fee - I cancelled.
I currently only use the PO to renew Car Licenses.
I receive 99.9% of communication, bills, magazines, etc. via email...