The dual tire weights are lower to allow the tires to bulge when loaded without rubbing each other. Of course that depends on how small the gap is between the two tires when mounted but thats the way they rate them.
The 90PSI is the max cold pressure. That is the max pressure you should pump the tire up to when the tire is cold which usually means that it has not been drive on in the last 4 hours or so. On a hot summer day driving a heavy load down the Texas roads expect to see that pressure got up at least 10psi or more.
Jim M.
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2020 Flagstaff Super Lite 26RBWS
Former: 2017 Rockwood MiniLite 2104S
2015 Silverado 2500HD 6.0L Gas
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