I don't know much about axles for the bigger rigs, and wonder about some with tag axles. I think I see some with a driven axle, but with two wheels on the driven axle.. and perhaps some with driven double wheels, and a tag? Do the tags go onto an axle of their own, but undriven.. or how does it all work?

Most tag axle coaches have a dual set of tires on the drive axle and a single tire on the separate tag axle. Now, I have seen dually's on both the drive and tag. It was a super C of some type. I would assume on a set up with double dually axles, that they are both drive axles.Our tag lifts (I have to hit the 'raise' button), but will lower if I go over 8-10 mph. If I haven't lowered the tag once parked, once I start to level the coach, the tag will lower at that time.MM.

On most coaches with a tag, the tag axle sits behind the drive axle. Drive axle is dual wheel, tag is single wheel. Tag just goes along for the ride but is there to allow the rear of a longer coach to handle more weight. For example, the drive axle on my coach is rated for 20,000 lbs and the tag rated for 11,000 lbs. Many coaches have a mechanism on the tag that lets the driver lift it several inches so you don't drag the tires in tight turns at slow speeds. Another benefit of a tag is more stable handling especially in cross winds and when being passed by large vehicles.

Good information above. Besides the obvious additional cost tags take up storage space. My 36' had 2 storage lockers behind the duals. Current rig has none. Overall there is more outside storage with the current rig (it's 6' longer) and tons of storage space inside.

Also my rig (and I suspect most DPs) does not have a solid tag axle as it would interfere with the drive train. Instead the tag is 2 independent axles.

A tag axle is installed for no other reason than a tag axle MUST be installed. If a single axle will not support the weight of the chassis then a second axle is installed to make up the difference. The tags are not powered in any RV that I am aware of but are rather a couple of tires that simply tag along. The tag axle tires have approx. 1/2 the expected life span of the other tires since the RV pivots on the drive axle and the tag axle tires slightly drag around the turn. If you ever want to see this exhibited in a drastic manner, watch what happens when an 18 wheeler makes a turn. Watch those tires at the very back of the trailer and you will immediately understand.

Tag axles? | Good Sam Community

smlranger
Explorer
Dec 19, 2013
On most coaches with a tag, the tag axle sits behind the drive axle. Drive axle is dual wheel, tag is single wheel. Tag just goes along for the ride but is there to allow the rear of a longer coach to handle more weight. For example, the drive axle on my coach is rated for 20,000 lbs and the tag rated for 11,000 lbs. Many coaches have a mechanism on the tag that lets the driver lift it several inches so you don't drag the tires in tight turns at slow speeds.

Another benefit of a tag is more stable handling especially in cross winds and when being passed by large vehicles.
Mr_Mark1
Explorer
Dec 19, 2013
Most tag axle coaches have a dual set of tires on the drive axle and a single tire on the separate tag axle. Now, I have seen dually's on both the drive and tag. It was a super C of some type. I would assume on a set up with double dually axles, that they are both drive axles.

Our tag lifts (I have to hit the 'raise' button), but will lower if I go over 8-10 mph. If I haven't lowered the tag once parked, once I start to level the coach, the tag will lower at that time.

MM.

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