I guess I should have asked this
BEFORE I spent all day running propane lines under the trailer.
I recently had my leaf spring axles swapped over to torsion. I have enough clearence to run my 1/2" copper main feed down the center of the trailer above the axle beams with less then 1/8" clearence. They are tied up and not touching it.
Now the question. The axle beam should not move up and down releative to the trailer, right? Am I in danger of smashing my lines while going down the road?
Like I said, I should have asked before... its all done now

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I did not have a nice enough pipe bender to go under the axles, thats why I went over.