Tire & Axle Question

Tnx!
:)

A single axle in the size needed for say a trailer with two 7k axles would need a 14k rating.

A tri axle with three 7k axles = 21000 lbs. That means a 22000 lb axle and two tires at 11000 lbs each.

A single axle trailer doesn't make sense from any perspective especially ride quality. A 14k axle and the size tire needed with a 7500-8000 lb rating would wreck the trailer and shake the truck severally. Balancing the hitch load would be next to impossible.

Multi axles ride better. Only one axle at a time drops into a hole so if you only have one axle....

Allworth wrote:
There is no such thing as equalization or load sharing on a single axle.

You are correct.
The single axle doesn't have the equalizer, but a single axle rubber torsion axle will usually ride better than a single axle leaf spring unit. The single axle doesn't have the problem of scuffing tires like the tandem or triple axles. The main reason for the multiple axles is because the trailer frame isn't strong enough to be supported by one axle.
A tandem, leaf spring axle, of the proper weight rating is hard to beat.
Could a single, dual axle work well for a heavier trailer? Yes, but the frame would have to be much stronger and the load on the TV would be greater to insure proper tongue weight. A single, dual, rubber torsion axle trailer (especially in the 7000-8000# rating) should tow real nice with the proper tongue weight and it would have the benefit of the second tire on each side to help if there is a flat.

It just isn't popular, but it would work. Remember, you would need a heavier front jack and good stabilizer jacks.

For the same reason 18 wheelers have 18 wheels. When you find out the answer to that question you will have the answer to yours.

18 wheelers and axels.

There is no such thing as equalization or load sharing on a single axle.

Like the answers in the other post:

Balance when empty or full could be an issue with only one axle.

Heavier support/main beams would be necessary if only one axle mounting point.

Much heavier axle needed to support 12,000 to 15,000 lbs.

The answer to your question is simple.

Marketing.
More axles - It must be heavier duty than few axles.....
More tires - It looks cooler.. .

Matt