This... "Or do you just send one person and leave everyone else waiting at the airport?"
The old bus system almost made it a necessity, but from what I've read the new parking structure makes it easy to walk or take the shuttle, then loop back around. I'll find out in Feb.
To the Original Poster...if you can get the $400 rate for next summer, I'd at least book it, you can always use AutoSlash.com to check and see if things improve. I booked a two week rental last April for Maui in February. Intermediate SUV via Costco was $505 all in. Taxes were almost as much as the rental. They've been at $800 or so since last May. While I expect to see a drop at some point, Hertz, at least, is showing limited SUVs already.
I assume mid-summer is equal to or worse than February.