Causes for & Ways to Prevent Trailer Tire Failure on 2011 Montana 5th Wheel  

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Trailer tires can fail from under- or over-inflation, operation at speeds beyond their rating and by overloading beyond their weight capacity. A tire can also fail from alignment problems in the trailer suspension. All of these conditions will cause the tires to overheat, which is the direct cause for their failure in most instances.

Trailers should always be equipped with only special trailer tires (ST type) of an appropriate load rating for the trailer's loaded weight. Trailer tires have stronger side walls than passenger vehicle tires. These are designed to handle the substantial vertical loads placed on them. We recommend that trailer tires be replaced at least every 6 years, regardless of tread depth and apparent good condition.

Dry rot can occur in much less than 6 years and it is certainly possible that more than the two failed tires have this potential problem. Small hairline cracks in the sidewall are a sure sign that the tires are done. After your unfortunate experience, I think you'll tend to agree that the investment in new tires can pay for itself in avoiding lost travel time and stress.

The linked page displays the three radial type special trailer tire options we offer in your ST235/80-16 size. Taskmaster ST235/80R16 Radial Trailer Tire # TTWTRTM2358016E is a Load range E tire capable of handling 3520-lbs at its rated pressure of 80-psi. This tire has a 10-ply rating and can be safely operated on the highway at speeds to up 81-mph (an M speed rating). This is the best tire we offer in your size. We do not offer Michelin trailer tires.

Apart from age, tires can also deteriorate from UV exposure, which is why many owners use tire covers when storing their 5th wheels in the off season. These can make a big difference in what you find come springtime. The linked page shows you the range of covers we offer that will fit your tire size. Your new tires will serve you best and last as long as possible if you protect them with covers during non-use periods.

Always inflate trailer tires to the maximum cold psi pressure noted on the tire sidewall; it is never appropriate to under- or over-inflate a trailer tire.

I have linked for you several articles that may be of interest; one concerns general information about trailer tires and the other the recommended maintenance schedule for trailers. This may be helpful to you in keeping your 5th wheel road ready.

expert reply by: Adam R

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