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Old 05-06-2015, 08:37 PM   #15
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I'm not sure if anyone mentioned the added benefit of have an extra axle with brakes?

Other downsides in addition to purchasing 2 more tires;
Extra Bearings and hub fluid to set and replace
Extra Ride height valve to maintain
Extra shocks
Extra Airbags

Of course all of the above are offset by stability and ride improvements over a single rear axle unit.


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Old 05-06-2015, 08:46 PM   #16
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^^ Don't forget the loss of one basement bay.
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Old 05-06-2015, 08:52 PM   #17
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We have a ford F53 with a tag axle . I love the smooth stable ride , but I do wish I had the extra bay on each side
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Old 05-06-2015, 08:56 PM   #18
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Quote:
Originally Posted by Thunderfoot View Post
Mr. D, you mention this coach is new to you. Porpoising isn't a normal condition and in my experience can be eliminated by adjusting the tag axle pressure assuming there are no air bag, shock, or suspension related issues.
Actually I noticed the same characteristic on the '98 Santara 35' gas unit. Plus it's been written about in the CC forum. Cure seems to be different shocks as the standard Koni's aren't up to the job.

I've been told, but haven't verified it, that the Magna tag is not adjustable. I hope it is since I might want/need to change the loading.
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Old 05-06-2015, 09:20 PM   #19
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Joe,

Your 40' Windsor and my 36' Dynasty are on the same chassis, so they probably both handle about the same. Yours possibly a little better because of the increased length.

Having said that, the 8 air bag S series Roadmaster chassis is so solid and handles so well that it's hard to understand the need for the tag axle.

I know the manufacture's reason for the tag is for weight. The only reason that I would be interested in the tag axle coach is for improved handling control is high side winds.

Jim
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Old 05-06-2015, 09:47 PM   #20
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Originally Posted by Mr_D View Post
Actually I noticed the same characteristic on the '98 Santara 35' gas unit. Plus it's been written about in the CC forum. Cure seems to be different shocks as the standard Koni's aren't up to the job.

I've been told, but haven't verified it, that the Magna tag is not adjustable. I hope it is since I might want/need to change the loading.
Thanks for the info... seems I have to relearn not to ASSUME anything on a regular basis! I should have included that my experience over the years has been exclusively with Monaco's adjustable air suspension tag axles, with the exception of OTR trucks. Hopefully your Magna tag is adjustable and your owner's manual addresses your question.

Some type of a proportioning valve system that treats both rear axles as one "unit" where the air bag pressure is concerned might be used if the tag is non adjustable. That makes me wonder if any of the CC owners have retrofitted an adjustable valve for the tag air bags to address these problems. A quick search on the CC forum didn't provide any additional information for me.

/thread hijack
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Old 05-06-2015, 10:36 PM   #21
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Our coach came with 60/40 proportioning valves. In other words, 60% of the rear weight was on the drive axle and 40% was on the tag. This ratio put too much weight on the steer axle and not enough onto the drive axle. I had the proportioning valves replaced with manual regulator valves. Long story short, I now have the correct amount of weight on each axle. It comes out to a 75/25 ratio between the drive and tag axles whether towing a trailer with a 1500# tongue weight or just the motorhome. It just takes different pressures in the tag bags to distribute the weight correctly. It takes a lot of trial and error with six position weighing to know what pressures to use. From what I have read, very few tag equipped coaches come from the factory with the proper rear ratios. Many of them do not distribute the total weight correctly ending up with too much weight on the steer axle.
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Old 05-07-2015, 07:54 AM   #22
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To clarify "too much weight on the front axle" statement above. The steer axle weight from the factory may not exceed the axle/tire rating, but is close. At the same time the drive axle can have as little as 14,000# on it while the tag can have 9000+# for the 60/40 ratio of the prop valves. A better 75/25 ratio takes 700-800# off the steer and 3500-4000# off the tag and increasing the drive axle up to 19,000# where it should be. It's pretty simple to accomplish, but few manufacturers pay attention to it unless the customer knows what to do. Then, some will correct it.
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Old 05-07-2015, 10:24 AM   #23
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Crasher, thanks for the info. I had wrongly assumed (since my old coach has it) that all coach manufacturers offered adjustable tag axles. It's certainly an effective and inexpensive way for the owner to adjust axle weight and it surprised me to learn that it isn't standard equipment on all coaches. I'm sure your updates will help others with the 60/40 valves who are searching for a way to address ride issues and control the axle loading/weight distribution on their coach.

Did your coach ever exhibit the "porpoising" that others have mentioned?
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Old 05-07-2015, 10:25 AM   #24
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Quote:
Originally Posted by Papa_Jim View Post
Joe,

Your 40' Windsor and my 36' Dynasty are on the same chassis, so they probably both handle about the same. Yours possibly a little better because of the increased length.

Having said that, the 8 air bag S series Roadmaster chassis is so solid and handles so well that it's hard to understand the need for the tag axle.

I know the manufacture's reason for the tag is for weight. The only reason that I would be interested in the tag axle coach is for improved handling control is high side winds.

Jim

Jim, back in 2012 we took a trip out west, going through 13 states, including all the "windy" states. Stability was never an issue! I did keep both hands on the wheel but it would not have been necessary. I have been amazed at how comfortable this coach is to drive!
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Old 05-07-2015, 10:38 AM   #25
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Crasher, thanks for the info. I had wrongly assumed (since my old coach has it) that all coach manufacturers offered adjustable tag axles. It's certainly an effective and inexpensive way for the owner to adjust axle weight and it surprised me to learn that it isn't standard equipment on all coaches. I'm sure your updates will help others with the 60/40 valves who are searching for a way to address ride issues and control the axle loading/weight distribution on their coach.

Did your coach ever exhibit the "porpoising" that others have mentioned?
No porpoising that I noticed. Much more stable than our prior 40' coaches with single rear axle.
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Old 05-07-2015, 10:46 AM   #26
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More$$$$$$$$--any questions? [smile].....
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Old 05-07-2015, 11:11 AM   #27
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No porpoising here, and compared to all the other coaches that we've owned over the years, this one by far is the smoothest riding and the best driving. I used to plan a trip based on the wind and the hills that we would encounter. Now, we just point it and go. Randy
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