Just wanted to give my thoughts on this....
I bought one of those aluminum jacks from HF a few years back when my steel allied 2 1/4 ton jack went out after 20 plus years of service.
The US general - (made in china) aluminum jack was garbage right out of the box, I took it back and got another one under warranty thank god. It worked fine but the dam thing kept falling apart!
Eveytime I turned around a nut or a bolt was lose on it somewhere, after tightening every nut and bolt on it twice with lock tight, the snap-ring that holds the spring for the lifting mechcanism popped off into never never land, I finally put it where it belonged, in the garbage can!
I ended up buying the heavy duty STEEL floorjack at HF for a meager 50 bucks and it's never gave me any troubles 3 years and counting.
Them aluminum jobs are nice especially when your having to use one on just about a daily basis and tote it everywhere you go like I do, but they just don't last like the good ole stand-by does.
I know somebody out there is making a decent well built aluminum jack but I can tell you this, its not at Hf and I'm pretty sure it's not cheap> JMO