work vehicle

Injured my left knee a couple of months ago. My Dart and pick-up I use for work are both standards. Would like to get a different vehicle for work, automatic, need something that I can work out of fixing helicopters at the hospital and more importantly road side repairs. ( Medivac helicopter operations). Was looking into either a mommy van, wagon or one of the small diesel vans. not used to any one of these type rigs.Reliability and mileage are the two biggest concerns. Any thoughts?