The only one I know of is Load Training (http://loadtraining.com/)
If you get in touch with Callaway Cars, Inc, Old Lyme, Conn.(http://www.callawaycars.com/) their service dept can put you onto an electric style...
Before you do, investigate Callaway Engineering, Old Lyme, Conn. They don't do diesels or generators but what they have done is built a...