What are you saying Cam?
is 1/4 good enough for the frame mounts?
Will doubling/tripling it up on the front of the bumper do the trick?
I was thinking I could drill some 1/2 inch holes in the pieces I'm doubling up then plug weld them for strength....
I believe he means, 1/4 is enough if you triangulate for the frame mounts. put a gusset or two on the mount plates so they can't bend side to side.
For the shackles, doubling up would work.