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Originally Posted by professorbol
First off: What is this the correct size tires to use for this trailer?
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Most people use 225/75R15 tires with an ST rating. Not everyone likes Marathons but that's what new Airstreams are shipping with:
Goodyear Marathon Radial
There are other good brands.
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Second: what is the maximum ply, and minimum ply to use?
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You probably want Load Range D, but you can figure it out yourself by calculating the weight on each wheel and looking at the capacity charts. They vary by size and sometimes a little by brand, but if you figure an 8000 pound loaded trailer, less 10% tongue weight = 7200 pounds on the axles, divided by four is 1800 pounds. For 225-75R15 tires, load range C is usually good up to 2100 pounds or so. Load range D is good up to 2500 pounds or so and will have stiffer sidewalls which will help slightly with sway.
Because the torsion axles don't do as good of a job as leaf springs in distributing the load evenly between the tandem axles when going over uneven ground it doesn't hurt to have some extra capacity in the tires.
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Third: Are there any other rubber items within the axle suspension I need to inspect/change before I tow this 94 miles home?
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I answered on your other thread.