Originally Posted by KYAirstream
Although your under a 15% bump in capacity, whereas a 15% bump in capacity for me puts my 3200lb axles at 3680lbs.
Did Airstream realize over the years that 3200lb rated axles were under capacity for a 31 ft trailer? While your excella is heavier than mine, it doesn't seem to be that much heavier, so it makes me wonder if my 3200lb axles were marginal from the onset?
3200 pound axles for an average owner of a 31 foot Airstream (Old Excellas excepted) is fairly OK.
But, todays owners carry far more things, and stay on the road for longer periods of time.
Accordingly, the axle rating can be increased to 3500 pounds for the seldom users. Increasing to 4000 pounds is OK, BUT
, the payload must also be increased, along with having the running gear absolutely balanced.
Part of that payload is full water. Total water weight for the later trailers, bumps 400 pounds. 50 gallons fresh, and 6 to 10 gallon water heaters, plus whats in the water lines.
Then add to that, at least a half tank of gray water and a half tank of black water, just to be safe.
Increasing axles from 3200 pounds to 4000 pounds REQUIRES
that more attention be given to proper loading as well.
As an example, if 3200 pound axles are increased to 4000 pounds, and the trailer is towed with empty tanks and a light pay load, the ride will be much harsher than if loaded adequately.
The heavier the axle rating, the heavier the payload MUST BE.
If not then damages will occur.
When replacing the older torsion axles, keep in mind the way you typically load the trailer, so that you can discuss your requirements with whom ever you choose to purchase axles from.
Axle ratings do not change the costs, but excessive ratings not using will certainly create repair bills.
Airstreams MUST HAVE
a soft ride. Loading torsion axles correctly will provide that soft ride.