We've just ordered three ambulances to be built from scratch to our specifications. I spent 25 years looking for an appropriate vehicle, and there are simply no existing vehicles out there that are a good fit. Our ambulances will differ from standard ambulances as follows:
-no sirens or lights
-no external compartments
-internal storage is modular instead of prebuilt
-a bit bigger in all dimensions so that we can freely walk around without stooping
But ours are also similar in many ways:
-double door in back
-same floor height to handle standard collapsible stretchers
-front right access door
Anyway, the plan is to position them in Salem, Seattle, and San Francisco. We also plan to expand to Los Angeles soon after that. There are ongoing discussions about how far we should expand.