How Much Clearance Should there be Between the Tops of the Tires to the Frame on a 5th Wheel Trailer
Question:
I have a 2013 Forest River Sierra 38foot 5th wheel RV. It came with the Equi-Flex suspension. I have had 3 tire blow-outs in the 4 years I have had this trailer. Every blow-out was due to tread separation from the tire. I looked closer at the suspension and there is only about 1inch clearance between the tire and the chassis. On the passenger side where all the blow-outs have accured the tire has hit the chassis to where the plastic and some wood has been chewed away. This is about another 2. My question/s are is 1inch enough clearance and what could cause the suspension to allow the tire to move enough to hit the chassis? This is clearly the cause of the blow-outs. Thanks!
asked by: Mike W
Expert Reply:
At just 1 inch of clearance it isn't nearly enough for your trailer. You really need about 4 inches or more to allow for the full travel of the suspension. There are a few reasons I can think of on why this would happen.
First, it is possible that the tire size on the trailer is larger than what is required for that trailer. I would check the literature for the trailer or the sticker or plate that has the gross trailer weight information on it to determine if the tire size on it now is correct.
Second, if the trailer is overloaded to the point where it compresses the suspension enough that could also be the issue. The remedy for that would be to make sure that the actual weight of the trailer is within the gross trailer weight spec. But it would have to be REALLY overloaded.
Third it could be worn out suspension or modifications to the suspension. If you were not the only owner of this trailer it is possible that someone made modifications to the trailer such as lowering it. Or, if you notice worn suspension parts (usually indicated by egg-shaped holes in the hangers that hold the springs) then that could cause a shift in the location of the axle(s) leading to tire issues. If you are unsure you can have the trailer suspension looked at by a mechanic or RV dealer with a service center.
Fourth, it is also possible that if the springs were ever replaced that the new springs are not rated high enough for the gross trailer weight. Or, if just one spring was replaced that could also be the issue. Springs should be replaced in pairs (on the same axle) and preferably on multiple axle trailers all the springs should be replaced at the same time. The reason is because if you did just one side the other side would be more worn out and can lead to tire issues.
Product Page this Question was Asked From
Dexter E-Z Flex Suspension Kit - Double-Eye Springs - Tandem Axle - 6,000 lbs
- Trailer Leaf Spring Suspension
- Equalizer Upgrade Kit
- Boat Trailer
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- Snowmobile Trailer
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- Double Eye Springs
- 5-5/8 Inch Long
- Tandem Axle
- Dexter
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