by KCStudly » Fri Nov 04, 2016 8:17 am
I'm assuming that you will be using a torsion axle and that the portion of the axle you intend to weld to is sprung (i.e. affixed to and moves with the chassis). The biggest concern is heat damage to the torsion rubber inserts inside of the axle tube. If possible, I would check with the axle OEM and confirm whether it is okay to weld at this location (I'm going to guess no, as most times they discourage welding to them at all and are very specific as to where and how welding is to be done if allowed).
If you are using the Timbren style axle stubs (not a good choice for an ultra light, IMO), then the connecting tube (or strut xmbr) that you weld between your axle mounting pads will be inert (so to speak), one with the trailer frame and it would be okay to weld to that. If that were the case you could just weld the draw bar directly to the xmbr and be done with it, no bolts required.
It goes without saying (but I will say it anyway) that you don't want to weld or bolt the draw bar to the tube of a leaf sprung axle as this would obviously impede articulation and would transfer a bunch of road shock to the TV.
KC
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