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Old 06-10-2012, 12:44 PM   #1
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uneven Worn Tires

WE took our camper out for the weekend. While setting up camp I noticed my front passenger side tire on my camper was wore on the outside. After further inspection all 4 tires were also wore on the inside. I double checked the to make sure they were inflated to the correct PSI. The tires had 44 to 46 psi in them. The 3 tires look brand new on the outside (except the one), but are wore all the way down on the inside. What else to I need to check? Camper is a 33 feet Zinger Crossroads. I don't think that I'm overweight, but I'm going to double check my weight on the scales. I also found out that in 2006, Lippert manufactured a bunch of bad axles. Axles are 3500 lb axles. Camper is 6400 dry and Gross is 8000 lbs. Looking forward to some suggestions.


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Old 06-10-2012, 06:53 PM   #2
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I just took my trailer back to dealer for very similar issue. Only the outer tread on my passenger side tires were wearing. Will let you know what I find out - could be the same problem.

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Old 06-10-2012, 07:21 PM   #3
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Trailer axles typically have a camber, bend in the center, to compensate for load, if there is too much camber you get the result you are experiencing. There are two remedies, OK three, live with it, replace the axles or have them recambered which could be done on a frame machine.
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Old 06-10-2012, 11:19 PM   #4
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Using your figures; axles are 3,500# ea. = 7,000# maximum on axles and 1,000# tongue weight. If your tongue weight is less and your trailer is loaded to GVW this means the axles are over-loaded, and most likely tires too. An equalizing hitch distributes the tongue weight between all tow vehicle and trailer axles, adding some tongue weight to trailer axles. Obtain your true weights ASAP, without them you are operating in the dark. Weigh tow vehicle loaded up ready to hit the road (don't forget all passengers, pets, and cargo), trailer the same way,then both hitched up so you know tongue weight on tow vehicle.

The ST (special trailer) tires should be inflated to sidewall maximum because virtually all trailer tires are operating at or very near their maximum load rating. Carlisle Tire goes further to state their warranty is voided if their ST tires are run at less than sidewall maximum.
BTW, the Tire and Rubber Industry says over 90% of all tire failures are due to under-inflation/over-loading.
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