I use the controller from a constant rotation servo (no limits) to power my gooseneck. I'm not too concerned with drwing too much amperage, it's a 6 volt gear motor w/a pretty significant reduction and the motor never really has to run for very long...
see my video on this post...
http://www.rctruckandconstruction.co...?t=2277&page=3
thanks,
Bill