Yes, the renter needs to advise the owner and make sure the owner approves that the RV can be taken across the US / Canada border.
The renter should print the booking voucher, a copy of the RV registration, the insurance certificate that the owner will provide them, and the roadside assistance voucher (if selected in the booking).

Our insurance and roadside assistance products are valid in Canada and the US except for the prohibited travel areas as mentioned in our Terms of Service.

To print the booking voucher, go to My Trips > Upcoming Trips, and the voucher is available under ”My Booking Documents”.