No reason at all and most diesel chassis come with such a valve installed. Basic pressure in the coach air system is typically about 125 psi, more than enough for coach tires (though it won't inflate very fast above about 105 psi - the air volume is too low for rapid inflation at that much pressure).
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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