[Shaun @ Tru6]

Thank you David, and I happen to have a beater truck.

I see some testing in my future. Probably should have ordered a lot more tube.

I'm also going to try the horizontal cuts staggered around the tube. It would be much easier to produce these.

Originally Posted by David

Goofing around with FEA with a model of a 2" OD x .125" wall 6061-T6 aluminum tube with 50,000 lb slightly offset force gives this result. It doesn't really show you how it would collapse though. I'd mock up a piece, bolt it to a tree or something else that won't give and bump into with a beater truck