I should imagine this idea is full of pitfalls
1) The car is leased to you generally not to any other driver
2) Insurance could be a problem.
3) if the "other" driver trashes the car. You leased it you pay
4) must be easier ways to make a few bob.
Depends upon the amperage of the supply.particularly on the Continent of Europe. You should check the supply relative to the appliances you propose to use or you will trip the supply at the box.