I will have to look at space in the cab, the space under the rear seat is already taken. I totally agree when it comes to medical training and understanding your limits as well as the Legal ramifications of actually helping someone should the circumstances necessitate it. I strongly believe there are a few things people should take seriously if they plan on doing a lot of back country exploring / Over-Landing, Medical - Navigation / How to use a map - Basic vehicle recovery - Basic Mechanics / understanding how your vehicle works - and some sort of basic survival. These things may seem like pie in the sky, sure would be nice but cost a lot of money things, but, maybe it means a formal wilderness EMT course and online studying for the rest to keep the cost and time commitment down. Maybe it also means you don't travel alone and instead cross load for lack of a better term the skill sets into different vehicles. Me, Im fortunate enough to have "A LOT" of formal training and experience in these areas so I am of course biased and see the need (just my opinion, not necessarily true for everyone).
I suppose there is this point were we each have to ask ourselves what is good, what is possible, and what is realistic, balance them all out and do what we can. Preparation is kinda like gear, you can't carry everything you might possibly need, but you can carry what you know you'll need. Also, if we spend all your time preparing and never go then what's the use in preparing.