Safety is very important. The longer the engine block, the easier it will be for a 3 wheel stand to flip over. I prefer 4 wheels.

Looks like the one in your pic is rated at 750lbs.

I bought this engine stand about 8 years ago for $40 on CL. The only "problem" I have with it is trying to get cherry picker in close. The wide spread of the lower legs make it a little tough for the cherry picker to straddle them.