In article ,
mark wrote:

My original jeep CJ-7 frame has rusted out and I was thinking of
building a new one from aluminum. Would 2 X 4 X 1/4 wall (if that is
even available) box tubing have the equivalent strength of the stock
1/8" wall steel frame? I would like aluminum because it will last
forever, no need of any paints etc..., very easy to work with and
cheaper than building a steel one and having it galvanized. My second
choice would be stainless 1/8" box tubing.

Aluminum is far less stiff than steel, and doubling thickness may yield a
too-floppy frame. I would stick with steel unless you reengineer the frame.

Joe Gwinn