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Old 10-31-2013, 10:57 AM   #29
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Jack is right on.

You also have to remember that the gross weight of the trailer is never on the axles, some of it is either on the kinpin or the front legs. So while 8k may sound light on dual axles, or 6k on triple axles, they are always technically sufficient to carry the load. And to go to higher than 8k axles will require dual tires (4) per axle. As mentioned above, Newmar used to do this, but that dual configuration presents other challenges to the frame design.
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Old 10-31-2013, 11:12 AM   #30
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Originally Posted by Wildbob52 View Post
This friend told me instead of three axles companies are coming out with dual wheels on camping trailers.
As stated, Newmar did it. I think I saw a Holiday Rambler with it. However, it is too much work to get to work, and the common consumer will NOT buy it. It will stay triples for long toy haulers and heavy heavy units.
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Old 10-31-2013, 06:13 PM   #31
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This friend told me instead of three axles companies are coming out with dual wheels on camping trailers.
Unless something has changed recently, Newmar was the only company in the industry to have duals. And they no longer make trailers.

The issue with duals is primarily the requirement for a narrow frame. This reduces stability and typically prevents a hung belly so the storage area is smaller than competitive units. It also results in less braking capacity and more tires that need maintenance and replacing.
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Old 10-31-2013, 06:23 PM   #32
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I don't believe there is any law anywhere about how many axles a vehicle can have--the limiting legality in some places is weight per axle. And an RV will never approach the legal limit per axle--they put a third axle to support weight of the unit WITHOUT having to go to dual wheels per axle side.
The normal highest weight rating of a two-wheel axle is 8000 lbs. To go higher, you have to have 4 wheels per axle. Its basically a tire limit deal.
Joe
Newmar, when they still produced 5th wheels, used to use two axles and dual wheels on their larger units.
Where does someone get that duals reduce braking capacity? More tires on the ground = more traction for braking.
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Old 10-31-2013, 07:27 PM   #33
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More traction, yes. More braking capacity, no. Unless they upsize the brakes, also. More tires/wheels = more rotating mass to stop from turning.
Rusty can say it better, or correct me, if I'm wrong.
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