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Old 09-11-2014, 08:43 PM   #1
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More sway when walking inside the trailer w new tires

A little over a year ago, I put Michelin LTX (P) 235/75R15 XL tires on my '08 27FB International. On the road, they're fine, but I might have made a mistake. My wife an I have been fulltiming for a little over two years, and accordingly, we spend quite a bit of time in campgrounds. My wife and I both feel that we have more sway when we are walking inside the Airstream with the new tires.

I wonder if the Michelin have a less substantial sidewall than the previous Marathons, causing the sway.

Now I'm looking at replacing the 15" Michelins with a set of Michelin LTX225/75R16 tires mounted on the Sendel T-3 16" wheels. My thinking is that the LT tires will have a sturdier sidewall and the wider wheel radius will result in a slightly shorter sidewall. Thus, hopefully eliminating the sway.

Any thioughts?
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Old 09-11-2014, 09:57 PM   #2
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The sidewall will be shorter, but not because of the wheel size. You can calculate the height of the sidewall as follows: 225(mm) x 75(/100) = 168mm= 6.64 in. The 235/75-16 is 6.93 in, or 1/2 inch taller. But the larger difference will probably be the difference in load capacity and air pressure, in my opinion, FWIW, YMMV, etc.

I'm surprised that you are noticing sway unless you are not deploying your stabilizers. My trailer has very little motion with them down.

Al
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Old 09-12-2014, 06:56 AM   #3
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Quote:
Originally Posted by flynaxos View Post
A little over a year ago, I put Michelin LTX (P) 235/75R15 XL tires on my '08 27FB International. On the road, they're fine, but I might have made a mistake. My wife an I have been fulltiming for a little over two years, and accordingly, we spend quite a bit of time in campgrounds. My wife and I both feel that we have more sway when we are walking inside the Airstream with the new tires.

I wonder if the Michelin have a less substantial sidewall than the previous Marathons, causing the sway.

Now I'm looking at replacing the 15" Michelins with a set of Michelin LTX225/75R16 tires mounted on the Sendel T-3 16" wheels. My thinking is that the LT tires will have a sturdier sidewall and the wider wheel radius will result in a slightly shorter sidewall. Thus, hopefully eliminating the sway.

Any thioughts?
Don't you have stabilizer jacks?
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Old 09-12-2014, 07:05 AM   #4
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I use the stabilizer jacks with the Cosco 14inch pads I also use scissor tire locks on both sets of wheels. I use 55 psi.
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Old 09-12-2014, 04:48 PM   #5
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Many on here use those tires, but they are a passenger car tire which is also rated for light trucks. I would expect that they would have a softer ride (and probably consequentially softer sidewalls) than a trailer tire and perhaps a full-up light truck tire.

I recently replaced ST tires with the 16" LTs and Sendel wheels. I didn't notice any difference in stability when parked, although to be fair, I wasn't looking for it.

Al
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Old 09-12-2014, 05:10 PM   #6
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Get yourself a pair of locking X chocks...the aluminum ones. I find that they do a great job of stabilizing the AS, by not allowing the wheels to move independently.
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Old 09-12-2014, 09:09 PM   #7
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Pump those 15 inchers up to the max psi, put down your stabilizing jacks, get the BAL wedges that go between the tires, and your problem will be solved..
For whatever it's worth.

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Old 09-12-2014, 09:38 PM   #8
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So, I noticed the wiggle when in our parked Airstream. I found the stabilizers slid on the plastic square blocks. I added a square of plywood to the top. Problem dramaticLly improved.

I added the Xchocks and that helped too. But what "rocked"'the problem were these:
Ultra-Fab Stackable Stabilizers for Small Trailers and Campers - 6,000 lbs - Qty 2 Ultra-Fab Products Trailer Jack UF48-979003

Setup trailer then put these under the plate where the axle mount.

The real fix was easy.
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Old 09-12-2014, 10:47 PM   #9
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The difference is probably the former tires were inflated to 65 psi and the new ones are inflated to 50 psi? Stiffness is more due to pressure than construction. How does the trailer tow? Have you noticed anything bad in the year you have towed it? Ply is basically a maximum pressure rating for tires.
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Old 09-13-2014, 08:04 AM   #10
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Get a couple bottle jacks and put under the axle mounting plates.

Perry
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