Originally Posted by DryFly
So I'm having a new axle installed on my 20' Argosy. I was advised to use a 4000lb rated axle. I just found the tag on the original axle and it reads 4500 lb.
Actual weight on the trailer is 3460lbs with full water tank, full hot water tank and full propane. Tongue weight under these conditions is 620lbs, so the weight on the axle should be 2820lbs.
Given the above, it looks to me that the 4000lb axle should be adequate even if I throw another 500lbs of stuff in the trailer (which I won't). I wonder why the trailer originally had a 4500lb rated axle?
Any thoughts? Is the 4000lb axle adequate? Am I missing something?
Argosy vs. Airstream, almost identiacal for weight purposes.
A 1972 Airstream 21 foot trailer used a 4500 pound axle.
Also, checking with the 1974 Argosy parts book, a 20 footer calls for a 4500 pound axle.
Down grading the weight rating of a torsion axle used on a Airstream or Argosy trailer, is an absolute NO NO, unless the trailer was completely redesigned and the weight was drastically reduced.
Adding 12 inch brakes instead of 10 inch brakes,is always a good thing.
But, 10 inch brakes are only good for 3500 pounds. Since your original axle was 4500 pounds and the replacment is the same, 12 inch brakes must be used.
Also, as Airstream learned in time, a lighter rating torsion axle will have it's rubber rods "give out" way too soon.
Example. 61 22 foot Airstream used a 3600 pound torsion axle, a 1962
used the same, a 1963
used 4000 pounds, a 1964
used 4000 pounds, a 1965
, 66, 67, 68 used 5000 pounds.
Your axle rating is "exactly" what it is supposed to be.