I have an aluminum 17" jack from PepBoys, some Chinese or such cheap model. Was about $160, now you can find jacks like this for $50 or so. Works great, other than all the bolts on it need periodic retightening, or they unscrew themselves from vibration (the jack lives in my truck, among the other tools I bring to the races). Should probably put a thread locker on them.
I also have a small 14" steel jack from K-Mart, Torin brand. Works great for over 10 years and I actually prefer it whenever possible over the large aluminum jack, since it's easier to carry around. In the lowest position it's a little higher than the aluminum jack, so it doesn't fit under my race car but fits fine under a stock Camaro. In the highest position it's too short for the truck.
And I have an AC Delco 15" steel jack. This one I don't like, so it sits in the far corner mostly unused. The ratio on it is wrong, the handle is light but you need to pump it great many times. And it's heavy, and a little bigger than the Torin jack, and higher yet in the lowest position. And in the highest position it's still too short for the truck.
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