First Philip
Your trailer behaves well on corrugations not because of independent setup (truly inspite of it)
If you correctly balance load carrying ability and suspension compliance with a solid axle you too will have the same ride characteristics PLUS left right balance.
Not all independent setups ride well- many surge all over the track left to right as the load is pitched left to right with no cross over load path.
Weeds you pretty well highlight the issue at hand!
The “trailer industry” is pretty shallow. Near enough is good enough and because we generally don’t ride in our trailers in Australia no-one really cares !!!
The industry wants as much cross platform compatibility and small engineered packaging size - actual performance is Barely considered.
For an easy example - have a look at the rear spring pack of an XD falcon wagon ... semi elliptical long leaf pack rates to about 1200kg - compare that to a 1200kg spring pack you buy at a trailer shop... may as well just weld the axle to the chassis and air the tyres down - I am serious.
So to answer your question I’m not aware of a in Australia of a commercial trailer based
Multi link solid axle air spring setup
BUT there are lots of options to get there
-Either scalping parts from known good vehicle geometries
-Building multi links from scratch
-buying multi link kits and axles from US supplies like Currie or RuffStuff etc etc etc
Steve
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