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Open Roads Forum  >  Towing

 > Tire pressure and bounce

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a_colebank

Bayard, West Virginia

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Posted: 07/28/08 05:09am Link  |  Quote  |  Print  |  Notify Moderator

We just bought a new Ameri-camp 326LE travel trailer and have been having some small towing issues. Originally we had some sway issues but after setting the hitch up differently and re-allocating our load those issues have been greatly reduced. On our last trip I aired my tires up to close to the max (60 psi, 65 psi is max) compared to the 45 psi that the dealership had them set to. I also aired my TV (2007 Expedition EL) tires up close to their max (42 psi, 44 psi max). To make a long story short I don't have sway but I now have some trailer bounce. I am going to drop the air in the trailer back down around 50-52 psi and give that a try on our next trip. We don't take much with us so we won't be even close to the max weight in the camper. Anybody else have issues like these? Should I drop the pressure in my TV too?

troll3193

SouthWest, MI USA

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Posted: 07/28/08 05:28am Link  |  Quote  |  Print  |  Notify Moderator

FWIW, every thing I have ever read about trailer tires, says you should run them at 100% of the pressure listed on the sidewall (cold), sounds like you have load range D tires (65psi max). 65 is what I would run in them.

As for TV tires, I keep more air in mine when towing, but on my truck there is specific guidelines from Dodge for empty vs loaded..

When you mention trailer bounce can you describe it more??

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mkirsch

Rochester, NY

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Posted: 07/28/08 06:09am Link  |  Quote  |  Print  |  Notify Moderator

Try slowing down on rough roads, perhaps?

JFG

TN

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Posted: 07/28/08 06:32am Link  |  Quote  |  Print  |  Notify Moderator

Trailer tires should be maintained at the max stated on the sidewalls.


Fred


SPRey

Orange County, Kalifornia

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Posted: 07/28/08 06:33am Link  |  Quote  |  Print  |  Notify Moderator

It could be your hitch height might be causing the TT tongue to bounce a bit. When your rig is set up for towing...is the TT a little higher--or lower in the front? At least in my situation...lowering the hitch ball made all the difference! My TT is about 1" higher in the back...or about 1" lower in the front.

Thanks to the mighty fine folks that posted several procedures for leveling your TT & TV...they work like a charm!


Tim & Sue
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a_colebank

Bayard, West Virginia

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Posted: 07/28/08 07:19am Link  |  Quote  |  Print  |  Notify Moderator

The roads are not rough just a little wavy from truck traffic and I am only driving about 50-55. The tires are D rated. When I go over these bumps the vehicle just kinda floats back to front. It's not that bad and I'm not losing control or anything it's just a different feeling than I had on the last trip. The only thing different is the air pressure. I have measured the hitch and feel pretty good about the setup. The trailer rear end is just a little higher than the front. Just thought it was funny that the only thing I changed was the tire pressures. I changed my W/D linkage a couple times but it really didn't help much. The goal is to have the TV front-end and rear-end pretty much stay the same even with the load on right? If so I have that working. It's not really a problem just was something that I hadn't noticed before and just wondered if anyone else had. Thanks.

Jack_Diane_Freedom

Lindsay Ont, and Gulf Coast Florida

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Posted: 07/28/08 07:23am Link  |  Quote  |  Print  |  Notify Moderator

If you lower the pressure you will get your sway back. The firmer side walls with the increased pressure is the thing that has reduced your sway.

a_colebank

Bayard, West Virginia

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Posted: 07/28/08 07:29am Link  |  Quote  |  Print  |  Notify Moderator

That makes sense. I'll trade the little bit of bounce for getting rid of the sway. Thanks for all the advice.

rlh6805

Michigan

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Posted: 07/28/08 08:38am Link  |  Quote  |  Print  |  Notify Moderator

If your TV tires only have a 44psi max, then this is your problem. You have "P" or passenger car tires on your Expedition EL. You need to go get some "LT" tires in a load range "E". These will have a 80 psi max and much stiffer sidewalls. This will eliminate the bouncing you are experiencing.


Rob and Cindy in Michigan
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a_colebank

Bayard, West Virginia

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Posted: 07/28/08 10:51am Link  |  Quote  |  Print  |  Notify Moderator

I'll be getting some new tires put on today. They have 6 and 10 ply and I'm going for the 10's. I'm assuming I should see a big difference in towing.

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