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Originally Posted by Magdefrau
I have sinced learn to keep the tire press at manufacture required PSI. Mine is 65psi. If you read much on the subject you may find that low tire pressure causes a lot of problems.
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camp_in_pa,
The above is the best advice any fellow RVer could give you. If your tires are rated for a maximum of 55 lbs., inflate to that pressure while they are cold (drive no more that a couple of miles to the nearest gas station if you need to).
The major failure of RV tires, other than age that someone else mentioned, is under-inflation. Under-inflation causes the tires to run hotter than they are designed to run and blow-outs are the result of under-inflation.
The designed maximum weight capacity of your trailer is based on full inflation of the tires. Inflating the tires to less than the maximum recommended by the tire manufacturer reduces the overall weight you can carry in the trailer, including the base weight of the trailer.
Keep you and your family safe by properly inflating the tires on your tow vehicle and your trailer.