We will have 4 drivers (2 teenager new drivers so not sure how much I will let them drive).
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Teenagers driving such a huge vehicle? NEW drivers at the wheel of a monster car with human passengers and innocent drivers on the road with them?
The very thought of this frightens me. Teens need years of driving practice to be able to drive in their own towns, much less in strange places with hills and....well, please don't do this to your family and whomever of my own far flung family who might be driving on those same roads.
Go talk to a Highway Patrolman and ask him/her what he/she thinks of putting a new teen driver behind the wheel of such a vehicle. They can probably tell you a few things that will curl your hair!! And THEN go to your own insurance agent...and tell the rental place what you have planned. Ask if your insurance will cover this trip.