Dual wheel rims have access holes in them to service the air pressure. Standard practice is the inner and outer valve stems are 180° apart for ease of servicing. Inspect your duals for that configuration.
Normally the inner dual valve stem requires a long stem air chuck on the air hose, like this:
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2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA.
"We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln