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Old 03-12-2010, 12:06 PM   #2
Motor31
Senior Member
 
Join Date: May 2005
Posts: 2,130
You didn't say what kind or RV you have and how heavy it is much less what weight capacity tires you have. The reason I mentioned that is that trailer tires are not the same as passenger car tires. The sidewalls are different as its the tread pattern. Larger trailers like the Mobile Suites that use the H rated 17.5" tires also generally have to go to a truck supplier to find those kind of tires as the car tire places don't stock them.

You need to know the size, and weight grade tires you have now and what the rig calls for. Do not assume the manufacturer or previous owner has the right grade of tires on it. Look at what weight the tires have to support and make sure the tires you buy are rated for the weight. Heavy weight capacity tires are classed as E, G and H rated. The higher the letter the higher the capacity. H rated being similar to semi tire weight ratings.

What is the Gross or max weight of the trailer? How many axles to you have? What does the manual recommend? Figure that 80% to 90% of the weight of the trailer is supported by the tires. Get weight rated tires for the axle capacity and weight the axles support. The max load of the tires is printed on the sidewalls as is the max cold tire pressure for that load.
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Volvo 660 MH tow vehicle
2005 MS 38RL
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