Yes, that's fine
Just rent the vehicle, without saying where your going its unlimited. Otherwise they make you pay mileage. As long as you return same City/State & location they don't charge mileage. If you say where, mileage is limited & you pay per mileage.
I've never seen the reveal agreement forbid it.
Shouldn't be a problem
No problem. We rented a car in Seattle and drove to Whistler a few years ago.
Thanks! Your answer is awaiting moderation.