some of the better torsion bar axles employ replacable spindles
they are simply a taper fit unit that is nutted on the inside of the arm
if on a tandem i'd just remove the wheel n tyre and drag it home for replacement of the spindle or complete refit w/ leaf spring assembly
if replacing w/ leaf springs i'd look at the way boat trailer spring assemblies are made for being able to move the assembly fore n aft for proper balance
QUITE SIMPLE
you can see in this pic of the port side(fwd to the left) the black angle iron brackets that the spring perches are welded to is bolted to the galvanized frame and the leaf springs are hung from them
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i made this assembly in 1991 and other than repacing the axle last year w/ an EZ-LUBE(lubes the bearings thru the spindle) unit it is still going strong
did the same thing(replaced torsion w/ leaf) on an old Starcraft tent camper to gain ground clearance for back country camping
first order of inspection of proposed trailer would be to crawl under it to see if the spindles are bolted thru or welded into the trailing arm
here's a pic of what i am thinking you might find
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now you have options
¿ replace a spindle ?
or ¿ replace a set of tandem axles ?
i'm thinking a spindle is about $75 - $80 ±
a set of axles would be several $100's...
just my 2¢ worth this morning
sw