Originally Posted by bbaXJ
They're standard HP60 tubes....something like 3.5"OD, .5" wall if I remember right. The truss is 2" wide so it covers some of the radius at the top and bottom, maybe that makes them look smaller.
3 1/8" 1/2" wall.
I would have started with a 05+ hp60 as they used 3 3/4" 1/2" wall for a truck that heavy. And I bet you could of used the ford's radius arm mounts for the links just about.