A friend with a 2 post lift was letting his friend use it to work on his chevrolet 1500 4wd truck. I can't remember what he was doing but he was jiggling the truck and it came down on him, bounced him out of the way, hard. He got really banged up, at least a couple months of recovery. The verdict was he did a half assed job of positioning the supports. I think 2 posters are fine if you double check the supports and the lift points on the vehicle aren't rusted out. I like the 4-posters a lot but extra $$$. Love to have one.
Yea, the supports gotta be just right. But also, if you are working and change the weight distribution in any way at all, that shit can come crashing down. For example, removing a wheel and tire. Pulling the transmission. Hell, even draining the oil out of the pan could change the point of balance and you're fucked. I'll never work under a 2 post. Fuck that noise.
You set the supports, lift the vehicle about a foot off the ground, jiggle the hell out of the vehicle to try to knock it off the lift. If it survives that, you're safe. A popular mechanic on YT Rainman Ray does it every time for safety.
I've seen videos on yt of cars that have been sitting on a 2 post for days getting worked on and all the sudden they come crashing down. Too risky in my book when you have a 4 post alternative that is a bazzillion times safer.
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