If he was on pads, that is a/k/a packages, a/k/a the Big Lick Performance Horses.
He not only doesn't know how to back up but I'll bet dollars to donuts he can't neck rein either.
Doesn't matter, you can teach him. TWH's have wonderfully big hearts and an eagerness to please --- it's what gets them into so much trouble with unsavory and unethical horse trainers.
If that's all you have to be worried about with a horse that used to be on pads, kiss the ground he gaits on
Since his name is Cash, if that's on his papers, he is most likely from the Coin's Hard Cash line. I LOVED that horse; got to smooch his snoot at Dr. Womack's<---- oopsie, no I didn't, it was Cash For Keeps I spent and hour loving on - lol
Cash For Keeps was Lite Shod. http://www.twhbea.com/voice/features/cashforkeeps.htm
Here's Coin's Hard Cash on "pads"; they only wear them on the front. This is what the lady was referring to. http://www.walkerswest.com/Champs/CoinsHardCash.htm