Hey

nice idea!

uuum im not sure but if you want to rent "legally" dont you have to register some where as a sort of bussiness or additional income, besides your normal work? seems kind of logical to me even if its just one bus!
What about visiting an existing "small" rent'a'camper bussiness and asking them?

Good luck, and yeah if i ever get the chance i might contact you about renting it

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Toyota Starlet 1988 1lt (Daily)
T2a 1971