Wall hangers weight about 2 1/2 lbs each. They can hold all models of QJ
The quickjack is quite heavy. If you are strong enough to mount the jacks up high, good luck lifting the quickjack to engage the hook. I have mine mounted so they cannot fall over, enough that they catch the lip of the hook and yet I don't have to lift them very high.
4" Inches... Just measured.. PWeber at BendPak/QuickJack