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Old 04-29-2016, 02:23 PM   #1
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Tag axle

Hi
New to MH's still searching. Can someone talk to me about tag axles, what they are and are they acceptable?
Tks
Michael
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Old 04-29-2016, 02:34 PM   #2
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What is it you want to know? They are there to increase the load carrying capability of the motorhome and they make the vehicle much more stable in the wind and she trucks go by. They cost some storage space but to me it is worth it.
Steve
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Old 04-29-2016, 02:37 PM   #3
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Quote:
Originally Posted by michael huot View Post
Hi
New to MH's still searching. Can someone talk to me about tag axles, what they are and are they acceptable?
Tks
Michael
Hi Michael, welcome to the forum

I can only speak about tag axles on our 38' gas coach which I consider acceptable in that they increase the load carrying capacity and enhance directional stability.

It's more common for diesel powered coaches to use tag axles and I would defer to DP owners to post their comments in answer to your post.

Best of luck, and safe travels.....
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Old 04-29-2016, 03:31 PM   #4
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you get more rubber on the road, increased carrying capacity and an additional set of brakes. You give up some storage space and add an additional layer of mechanicals. I am looking to upgrade my coach and only considering a tag, though if you are going over 40' a tag will likely be your only option. In 40' MHs you can find both configurations in the used Market. I can't comment on the new market as I am not looking there!
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Old 04-29-2016, 03:35 PM   #5
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I have had both, and the tag is the way to go for best ride and handling. However, your tire replacements will include two additional tires and there will possibly be some minimal maintenance needed on the tag axle so the cost is higher.
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Old 04-29-2016, 04:06 PM   #6
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We decided to stay with a 40' MH so there was no tag axle! I didn't want the extra cost of the tires and possibility of extra maintenance costs!
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Old 04-29-2016, 04:17 PM   #7
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Not to mention, that every time you drive on a toll road you must pay extra for that tag axle.
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Old 04-29-2016, 10:02 PM   #8
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We're in a 44' coach with a tag axle ... the sticker says the coach has a 6,776 lb net carrying capacity. Subtract 835 lbs for a full tank of water (100 Gal) and 150 lbs for a full tank of propane (39 gal) ... and that still leaves us with 5,800 lbs of carrying capacity for DW and I along with our stuff.

While we'll certainly never come close to that - it's nice to have "headroom" and not having to sweat much about being overloaded.

...and that is all because of the tag axle.
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Old 04-29-2016, 10:11 PM   #9
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Our 40' Dutch Star didn't have a tag and weighed about 33,000#'s loaded. Moved up to the Magna with a liftable tag. The unloaded weight is over 46,000#'s and the GVWR is 54,000# and the GCVRW is 69,000#'s
But due to the better wheel cut and lifting tag it turns just as well as the smaller, lighter non-tag Newmar. You do lose storage space with the tag though and I could use more bay storage space as two of the storage bays are taken up with batteries, one with the wet bay and one with the AquaHot. That only leaves 3 pass throughs for actual storage.
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Old 04-29-2016, 11:44 PM   #10
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Michael......In simple terms....Federal law says that you can only place 20,000 pounds on any one axle. This is to limit the weight placed on a roadway by a single axle. Several years ago they made an exemption and allowed up to 23,000 pounds on an axle for RV's. Once a coach gets past that weight, they need to add an additional axle to share the weight. Since this is about weight, you generally only see a tag axle on larger coaches. Many of your larger coaches can be 30K-35K on the rear axles. The dual axle might typically take 20K of the weight and the tag will take other 10K.

Before the gas chassis' were beefed up in the last few years, some manufacturers were selling some long coaches with short frame. They had to add a tag to support the length and weight.

Obviously, once you get to a certain size coach, typically, over 40', the coach will come with a tag axle. Some of the pros are better directional tracking, added weight capacity, more braking power and in some of the new steerable tags, a tighter turning radius overall.

Some of the cons are the addition of two more tires to buy, more drag and loss of storage space.

I previously owned a 36' DP with a single axle. When I bought my new coach, there were certain things that I wanted that my previous coach didn't have. Those items included a side radiator, tag axle and independent front suspension. When I went shopping, I wanted a true 40' coach and a tag. Newmar is currently the only company making them (new).
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Old 04-30-2016, 09:41 AM   #11
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Nice job of keeping the explanation short & simple, Don.
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Old 04-30-2016, 11:45 AM   #12
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Quote:
Originally Posted by Dutch Star Don View Post
Michael......In simple terms....Federal law says that you can only place 20,000 pounds on any one axle. This is to limit the weight placed on a roadway by a single axle. Several years ago they made an exemption and allowed up to 23,000 pounds on an axle for RV's. Once a coach gets past that weight, they need to add an additional axle to share the weight. Since this is about weight, you generally only see a tag axle on larger coaches. Many of your larger coaches can be 30K-35K on the rear axles. The dual axle might typically take 20K of the weight and the tag will take other 10K.

Before the gas chassis' were beefed up in the last few years, some manufacturers were selling some long coaches with short frame. They had to add a tag to support the length and weight.

Obviously, once you get to a certain size coach, typically, over 40', the coach will come with a tag axle. Some of the pros are better directional tracking, added weight capacity, more braking power and in some of the new steerable tags, a tighter turning radius overall.

Some of the cons are the addition of two more tires to buy, more drag and loss of storage space.

I previously owned a 36' DP with a single axle. When I bought my new coach, there were certain things that I wanted that my previous coach didn't have. Those items included a side radiator, tag axle and independent front suspension. When I went shopping, I wanted a true 40' coach and a tag. Newmar is currently the only company making them (new).
Good explanation.

I have to question the statement that manufacturers are making about the new steerable tag. IMO if the wheelbase and steering cut are identical on two coaches there will be little difference in turning radius between a steerable tag and a tag with the air dumped.

If you read the promotional literature they do not seem to compare the same dimensions/specs when they claim anywhere from 10 - 17% decreased turning radius.

A steerable tag will reduce tire scuffing on a tag but even if the tag is not dumped it is highly unlikely most owners will replace the tag due to wear before the tire ages out.
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Old 05-01-2016, 10:50 PM   #13
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Freightliner is saying their new steerable has a 10% tighter turning radius with a steerable tag. I watched a Newell video the other day and the Newell Realm is advertising a 7% tighter turning radius with a steerable tag.

If you think about it, it's pushing the duals into a tighter turn radius. I don't know how big of a deal it is. I'm pretty impressed when I stick my head out my driver's window and see my front tire at an almost right angle to the body when turning (55 degree wheel cut).
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Old 05-02-2016, 06:10 AM   #14
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Or was the steerable tag just another product in the long line of stuff developed by the mfg. to have something new to sell? It sure adds a lot of parts to a previously simple axle. And the worst part is it makes the rear look fugly.
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