To me a floor jack and trolley jack are the same thing. I would not trust the super cheap line as I just checked their recalls and their car stands do not meet the design rules.
Murry any chance you can get me the model of the one your mate purchased. Is it the blue one made by Blue-Point? I checked their web site and they have no low profile ones listed. My friend has one in their work shop which is the non-aluminium type.
I picked up a nice trolley jack from an Auto One. Don't have the make and model anymore (the sticker fell off the exterior) but its got a 1.7 ton lift rating and it gets under my lowered Z, and its never failed me yet.
Please don't buy the super cheap trolley jack. I was using one at a mates place and a front wheel gave way, the jack fell onto its side, and the car of course fell onto the floor.
2 lessons....always use chasis stands, and don't buy a jack form supercheap.
Many jacks will not fit under a Z so check first.....keep in mind you should never jack a car from the sills, you should use the front or rear subframe or possibly the chasis rails if you must. The jack will need to be loooow and long.
Make sure to get a good quality jack and jack stands. This one mechanic I knew just used floor jacks for a quick oil change and the jacks gave out and killed him. So get a good set of jacks and ALWAYS USE JACK STANDS!
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