Mauna Kea tour company recommendations?

[Carey]

Good thing is that it is not as much about weight as oxygen use, my hubby is way far slimmer than I am, & he is more prone to headaches, also have had study partners that spend a lot of time at 6kft & turned ucky at the summit...

Luckily I follow the oxygen use of my namesake turtle & so have only really have stupid things to deal with, but that is at any elevation for me (again, like the namesake!)