OK, for the members that are unsure about these stands, I suggest you try a little experiment.
Using 1 "lever-locked type stand" lift the moveable section up 1 click/notch. Now, Stand on the moveable section with one foot, and while standing with your weight on the stand, use your other foot to "lift " the lever to release the stand. IF you are able to do this, your stands are junk.
Please post your results, and notify the manufacturer of the stands that you own if they fail. Possibly for a replacement.
Remember that the "cheap" stands are usually rated for 2tons, and they are designed to be used in pairs and are sold that way. That is a total load capicity of 8000 lbs.
A gen-1 Montero weighs in at 3300/SWB to 3700/LWB lbs, and that is less then 1 of the cheap stands.
Kary