old Miller equipment trailer suspension?

I hav a mid-70s Miller 12000 Lbs tilt deck trailer and broke both springs hauling a 9500 Lbs Bobcat on bad mountain roads today. Both showed rust in the crack at least 3/4 of the way through, so it wasnt someting I did today, it was just time.
It is an unusual setup, a walking beam spring like this, only the axles are below the spring.

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There is a spring shop 90 miles away who can make new springs, but I should take the pivots apart and see about rebuilding them too.
Does anyone know of a source for parts, or if the pivots are made of common parts for something else?
 
It looks like the loose trunion is an easy fix, the tack weld broke and the pin walked. Ill re weld it and make a new bushing. Removing the springs was fun. At some point someone replaced the spring perches on the axles and put bolts inside before welding them down, but did not weld the bolt heads down. I am sure thatwas fine when they were shiny, but with no way to hold a wrench on them I had to MIG weld each head,looking through a mirror. The nuts on the trunions would not budge, until after I heated them red and let them cool a bit. All nuts will be replaced and anti siezed. The good news, after a 90 mile drive to the slum of Stockton , the spring guy said no problem, pick them up Tuesday. Nice day in central California, saw a lot of guys working the fields and the orchards are green until they cut the water.
 
Got r done. If anyone searching the archive has the same problem, Moores spring service in Stockton, Ca has the pattern now and can ship
 

I used to have a early 80s tilt top miller.. think is was a 24,000 capacity.. It had no springs, it had walking beams.
 
I did not know that Miller trailers had springs. When I worked construction we used a single axle Miller with no springs and it worked good for all sorts of jobs behind a truck.
 

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