I rack vehicles all day, as a part of my job. I try to rack them as best I can for weight, considering lifting points. Then once a few inches off the ground I shake them real good. Never had one fall off yet. Had the feet on the rack slip down while I was under it, which can be exciting, but never had one fall. Being retained by 3 legs will at least allow it to be set on the ground to be re-situated. Back to the question at hand, you'll lilely be fine picking it up as far forward as you can. Think of it this way: Most modern cars have the majority of the weight on the front, yet can't be picked up until behind the front wheels.
Devin
