After many nights tossing and turning thinking about this, I have come up with my solution to the lifting of the axles to change tires.
I used a 3 point contact device. When you lift, you are parallel with the axle, when lifting, you have a shift of the axle off of that line, so your lifting contact point is narrowed. With the 2" or so bottle jack top, or anything that is fixed, you have tons of weight on a very small contact point that gets smaller as you lift.
My 3 point contact lifts up until there are two, it 'Rock's little.
I think this is safer, stronger and you can straddle the U-rod that attach's to the frame.
http://picasaweb.google.com/Jimsue13...eat=directlink
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