You can pull start a auto clutch trike. The shifter works like a manual clutch.
Get all set up for the pull. Push the shifter down (or lift it up) to go into the gear you want for the pull, and hold it there (up or down). Have your tow vehicle get you moving, while you are holding the shifter it is just like having a manual clutch pulled. Once you are up to tow speed, let the shifter return to the center position, that will be the same as releasing a manual clutch.
ATCnut
82 185s - sold
83 200x (hopped up)
84 200x (stock)
84 70 (lost this one to the DMV)
85 70 (soon to have lights, a foot brake, and CDI ignition)
84 200es (parts trike) - sold
85 350X (the best)
85 350X (siezed motor, dream of a poweroll kit someday)
85 250sx (frame was trash, got parted out)
86 250sx (the tractor)
86 250sx (a nicer tractor)
86 250sx (an even nicer tractor)
87 200x (parts trike, its really rough, a dog was chewing on it for a while)
87 250es Big Red (the tank!!)