Thank you for all the suggestions and help.
The fast part of the trip will be for the guys driving from SC to Vegas. I will be flying out on Wednesday for a conference and will spend Thursday and Friday at the conference. They'll be meeting me either Friday and spending the night, or meeting me on Saturday, at which point we'll start heading back. Since they won't be paying for round trip airfare, I might be able to swing an extra hotel night from my company and leave on Sunday. I expect we'll mosey home in 5-6 days.
Now, we just have to hope we can both get that week from work. I'm not entirely sure my bosses will be on board with me being gone essentially 2 weeks, but I am VERY valuable and hope that will help my case.
It's a once in a lifetime trip for us, and I just hope we can make it happen.