Two quick thoughts, and this comes from a perspective of only having a WFA/SAR training.
1. Airway management could get tricky, both practically and legally speaking. I would imagine there could be a number of complications from tubes/etc? Just something I read on a few posts online, so some of the folks with higher certification could speak better to this.
2. I keep a c-collar in the car. Mostly because I do a fair bit of driving by my self and with so many activities here in colorado could have an MOI associated with spinal damage, it would be nice to be able to stabilize the neck and then have hands free to do other first aid while waiting for additional assistance. Plus a c collar is cheap, and packs flat. I got this one: http://www.amazon.com/LAERDAL-STIFNE.../dp/B000FPZI0M
'97 lx450, 170k, factory lockers, ome 850/863, 285's, 4 working doors(1 more than the old fj55 )
'74 project pig (sold