I would expect the axle mount brackets welded to the axle tube before the insertion of the rubber rods.
Here is the link to the axles in question.
http://airstreamsupply.com/New-Axles?product_id=6259
The closeup pictures were provided to me from AirstreamSupply.com
The one with the vertical section of the axle mount bracket toward the outside is Aistream specific and how all vendors sell them.
The ones with the large flat portion away from the axle is "standard Dexter" mount style. And that is how the discounted axles are configured.
The third picture I snagged off their website because it shows the welded on shock mount tab.
From the phone conversation with AirstreamSupply
If you want to use the discounted axles in a stock configuration they said the mount brackets would have to be cut off the axle tube and flipped.
When I called them, they made no mention of any modification required to the trailer frame itself. I would never weld an axle to the frame. I'm sure it would work, be ugly and make future repairs more difficult if you had to remove thevaxle arvalign it. (Just don't do it)
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If you use the axles with a lift kit (as I would) no axle mount modification is necessary because the lift kits use the TOP mount holes not the side ones.
If you want to use them in stock configuration, the welding on the axle tube *could* cause issues with the internal rubber rods, because you would be welding right next to them. If I were going to use them in a stock configuration I would NOT cut off the old brackets, instead I would create a new c-shaped bracket that is bolted and welded to the existing bracket, and the new bracket would have "stock" mount holes in it. It would only be welded to the mount bracket not the tube, that way the heat should not affect the rubber rods.
Any competent welder should be able to add the shock mount tabs to that hefty cast iron downleg without generating enough heat to cause any issue with the rubber rods inside the axle tube.
Axle mods are not for the faint of heart.
If any of this makes you feel concerned.
Buy one of the many commercially available ones.
Here's the link to Colin Hyde's website.
(I've never used any of his products, link provided because he was referenced in a previous post)
https://sites.google.com/a/colinhyde...ions.com/home/