I sure hope you are planning to bring this down to the Overland Expo next year! I really want to see the finished product in person! (If I may be so bold)
It is looking really good, and I like the airbag idea as well. You said the bags are set for 10-100psi, but that you only have 4 psi in them now. Not having any experience with those at all, how much presure are you going to need with that added approximately 400lbs worth of gear and family? The reason I ask is if the bags only need to go up to, say, 50psi at your most, would there have been a way to build so as to increase the PSI requirements the way it sits now, thereby making better use of the bag system? (Again total novice on the bags, so trying to learn, please forgive me if this is a totally stupid question.)
Cheers,