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08-19-2011, 07:04 AM
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#1
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Senior Member
Winnebago Owners Club Coastal Campers
Join Date: Oct 2009
Location: Marathon, Florida
Posts: 2,909
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Why do I need "ST" tires?
On our boat trailer there were 3 Goodyear Marathon tires and one Chinese replacement when we bought the previous owned boat. The "China bomb" is falling apart, the Goodyears are OK. I assume the PO had a blowout or something and replaced just the one with a cheap-o.
So they are ST205/75R14 and very expensive for a trailer I take about 500' from the driveway to launch and 2 miles on occasion to go to a gas station. Why would a passenger car tire not work? The boat and trailer doesn't weigh much more than my SUV and passenger tires are fine for it.
BTW I have no problem getting a couple of the Goodyears but if something that is safe will work for less why not?
__________________
Mark & Nancy
2004 Winnebago Vectra 40KD
Shep dog, R.I.P. Kenzie dog Toad 2015 Jeep Wrangler Willys Wheeler
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08-19-2011, 07:46 AM
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#2
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Senior Member
Join Date: Nov 2009
Posts: 1,365
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As long as the new tires are rated for the weight I don't see why they wouldn't work just fine.
Mark
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2021 Trail Runner 211rd 25'
2015 GMC Canyon
Mark & Carole Big Bear, Ca. RVM 54
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08-19-2011, 09:53 AM
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#3
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Senior Member
Join Date: Nov 2005
Posts: 3,968
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Trailer tires are generally rated to carry more weight than the same size car tire. They also have stiffer sidewalls so the trailer follows better. I had 4 goodyear LT tires on my 10,000 lb trailer for several years (the trailer itself weighs 2,100 lbs). They seemed to do the job, but the trailer seemed to bounce along rather noisily. Last year I replaced them with trailer tires. It follows better and is quieter than with the light truck tires. The trailer tires were a little less expensive than the automobile tires that could carry the same weight. After experiencing the difference I would never go back to a car or light truck tire.
As a side note be sure the tires you buy are physically the same size as the ones you intend to keep. I've had different manufacturers tires with the same size printed on the sidewall that weren't even a close match. In one instance one brand of tires were almost 1" taller than another brand even though they had the same sizes moulded into the sidewall
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Hikerdogs
2013 Adventurer 32H
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08-19-2011, 12:39 PM
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#4
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Senior Member
Fleetwood Owners Club American Coach Owners Club
Join Date: Mar 2011
Posts: 6,768
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The manual for my 5th wheel said either STs or LTs are acceptable. As noted above, the STs normally have a higher capacity, but, in my experience they do not hold up nearly as well as LTs. Don't know about "P" tires.
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2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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08-19-2011, 12:43 PM
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#5
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Senior Member
Join Date: Aug 2008
Location: Georgia
Posts: 8,638
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St trailer tires have stiffer walls if you don't load to capacity you will be ok. I just purchased 2 for my utility trailer $85.00 each not taking a chance on $50.00 difference.
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2007 Fleetwood Revolution LE 40V
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08-21-2011, 12:00 AM
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#6
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 24,076
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HD4Mark......I had a 4500 pound SeaRay with tandem axles that I had for 18 years. We trailered it several thousand miles a year. When the boat was new, I replaced the trailer tires with steel belted radials. The radials really made it ride better and tracked well. I never had an issue.
The ST trailer tires are a different compound that are made to last for years.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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08-21-2011, 07:16 AM
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#7
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,676
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The tire people recommend against using "P" tires on trailers because of the greater flex in the sidewalls. The stiffer sidewalls of ST and LT tires reduce the tendency of the trailer to roll and sway. But I think in your situation a P-type tire would be fine as long as it has a sufficient load rating (Load Range or Load Index).
I would be a bit concerned about putting a P tire on one of an axle and a ST on the other end, though. That could lead to some interesting sideways movements on the highway. You really want both tires on an axle to be the same type and size.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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08-26-2011, 03:43 AM
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#8
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Senior Member
Join Date: May 2011
Posts: 236
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The Tire & Rubber Association recommends derating by 10% or so the carrying capacity of P-rated tires when used for trailers. That said, I used P-rated tires very successfully with an old Airstream for many years, but the tires I used had some 25% reserve margin.
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