Evan
We certainly use quads a lot in Mountain Bike races for medical cover. Although usually as a way for the medic to reach the incident rather than for patient transport. We use these guys a lot
Extreme Medics The partners in the company being friends of mine, a result of having worked with them for over ten years now.
As an International Mountain Bike Official I have on a couple of occasions in the past assisted the movement of casualties out of inaccessible places on a stretcher on the luggage rack of a quad at very slow speed. Simply because we didn't have enough bodies for a carry but it is not something I would really recommend. Your trailer looks like a really good solution to the problem of patient transport over rough ground, especially when the only alternative is a long carry. I've assisted in a couple of Mountain Rescues and being on the stretcher team is no fun. Mind you being in the stretcher isn't either having tried it once. And that was an exercise so I wasn't even injured.
It is interesting that Chris Lee (Quad Response in Cornwall) has just got himself a Can Am Outlander too. They're like London buses.... nothing for ages then two come along together
Cheers Tony