[greglepore]

I store mine under a lowered r129 benz, you can drive over longitudinally no problem.
I don't think the heavier ones are much larger, haven't actually looked, but think its mostly just a bigger capacity cyl.
And yeah, you do need to allow for either fore/aft or lateral movement when you lift.
To beat the weight, there are youtube vids about using very low profile half ball casters. It does help when positioning them.