Mauna Kea tour company recommendations?

[Mimosa]

Harper's Truck rental is the only local company that actually allows it's rentals to go to the top of our majestic peaks,and down into WyPO valley.
The other vehicle rental outfits all ban any travel to said places.
Drink plenty water prior as the human body evaporates quarts of liquids at such a high altitude .
We do access MaunaKea summit one or two times a month and know our own limits.
Main thing,is safety 1st and have FUN.
Mrs. Mimosa