I'm not talking about a bike meant for those that lack the use of their legs, I'm talking about a freight bike that can either be pedaled in the regular position or the user can get off the bike and push it up a hill with their shoulder on a pad and pedaling a second set of cranks with their hands. I seem to recall this may have been a military transport bike used by the Viet Cong. Does anyone have a picture of something like this? I've searched and can't find anything.