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Author Topic: 5th wheel with 3 axles  (Read 4800 times)

bigtexan99

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5th wheel with 3 axles
« on: November 15, 2006, 09:34:49 PM »
I'm shopping for a used 5th wheel and saw a unit with 3 axles.   

Does the 3 axle 5th wheel tow any better than the 2 axle 5th wheel? 

My real question is what is the purpose of the 3rd axle.  Is it just support for more weight?  Or is it for towing stability.

Thx

Frizlefrak

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Re: 5th wheel with 3 axles
« Reply #1 on: November 16, 2006, 01:28:05 AM »
Fifth wheels by nature are VERY stable to tow (assuming you're using a tow vehicle with the correct GVWR).  I could be wrong, but the only reason I can think of to add a third axle would be for weight.

How long is this fifth wheel you're looking at, and do you know what it weighs?  And what are you using for a tow vehicle?  I would look good and hard at the numbers before I bought something that size, just to ensure that your tow vehicle is up to the task safety wise.

Good luck on your search.  :)


Gary RV Roamer

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Re: 5th wheel with 3 axles
« Reply #2 on: November 16, 2006, 07:58:55 AM »
Just to carry the weight without using expensive, high capacity axles with huge tires and big brakes.  Most RV trailers limit axle capacity to around 7000 lbs each and add axles as the weight of the trailer goes up.  Thus trailers over around 13,000 lbs GVWR will have more than two axles.

A 2 axle fifth wheel tracks so well that any benefit from a third axle is of no interest.  And there is actually a slight negative because the trailer turns on the front-most  axle and drags the others slightly sideways as it goes. This "scrubbing" tends to wear the tires on the other axles a bit more than the front one. Rarely a big concern, but it may be observable at times. Make a sharp turn on sandy soil and you will actually see the drag marks in the sand.
Gary
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Gary Brinck
2004 American Tradition
2007 GMC Acadia
Homebase: Ocala National Forest, FL

Shayne

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Re: 5th wheel with 3 axles
« Reply #3 on: November 16, 2006, 09:07:29 AM »
3rd Axle does have advatage but only to Tire manufacturers.  The drag really tears up the tires whe cornering in tight areas, which happens more frequently then you would expect.
Old, Stubborn, Opinionated, Set in my Ways, and Independent,  IMHO

Gottasmilealot

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Re: 5th wheel with 3 axles
« Reply #4 on: November 16, 2006, 09:41:04 AM »
Toll roads like them.  It allows you to use the vacuum toll lane where the suck all the cash out of your vehicle as you pass.  ;D
Keith

Shayne

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Re: 5th wheel with 3 axles
« Reply #5 on: November 16, 2006, 09:58:46 AM »
Yep  I know the feeling   When I go thru them it's 5 axles  3 on MH(Tag) and 2 on trailer.
Old, Stubborn, Opinionated, Set in my Ways, and Independent,  IMHO

GaryB

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Re: 5th wheel with 3 axles
« Reply #6 on: November 16, 2006, 11:29:39 AM »
Just to carry the weight without using expensive, high capacity axles with huge tires and big brakes.  Most RV trailers limit axle capacity to around 7000 lbs each and add axles as the weight of the trailer goes up.  Thus trailers over around 13,000 lbs GVWR will have more than two axles.

A 2 axle fifth wheel tracks so well that any benefit from a third axle is of no interest.  And there is actually a slight negative because the trailer turns on the front-most  axle and drags the others slightly sideways as it goes. This "scrubbing" tends to wear the tires on the other axles a bit more than the front one. Rarely a big concern, but it may be observable at times. Make a sharp turn on sandy soil and you will actually see the drag marks in the sand.

Hi Gary (RVRoamer)

I just wanted to compliment you on how clear, thorough, helpful and grammatically correct that your responses are!  I bet you could write an excellent RV “user’s guide” type of book!  I, for one, would buy it!

Thanks again for all your help in answering our questions
Gary

Jack

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Re: 5th wheel with 3 axles
« Reply #7 on: November 17, 2006, 11:27:52 AM »
 A three axle" 5th wheel" is really called a 7th wheel--just being more accurate.

Gary RV Roamer

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Re: 5th wheel with 3 axles
« Reply #8 on: November 17, 2006, 08:35:44 PM »
Quote
grammatically correct...

My high school teacher would be ecstatic to hear that...  8)

Thanks...
Gary
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Gary Brinck
2004 American Tradition
2007 GMC Acadia
Homebase: Ocala National Forest, FL

John From Detroit

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Re: 5th wheel with 3 axles
« Reply #9 on: November 18, 2006, 07:18:27 AM »
Toll roads like them.  It allows you to use the vacuum toll lane where the suck all the cash out of your vehicle as you pass.  ;D

ROFL  (True too but ROFL non the less)
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Tinner

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Re: 5th wheel with 3 axles
« Reply #10 on: November 22, 2006, 01:31:59 AM »
I've put a lot of miles on both double and triple axle trailers.  Yes, it cost more for tires as you have two more.  There is another pair of bearing to pack also.  I haven't noticed a big difference on tire wear as mentioned above even though it is correct that you get a sliding motion as you do with even the double axle too.  I rotate my tires.  If you want to have fun, go to your local tire store and ask for a 5 wheel rotation, no body seems to know how to do that anymore.  Personally, I prefer the triple axle.  I have a 36 foot Cardinal with triple axle.  Never lost a tire on it but have on gooseneck trailers of both type and get less negative reaction from the triple axle trailer.  Good Luck.
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