A cheap inspection camera would work like a charm to look at the ducts. You may have to look from the end of the run by removing a vent. While inspecting, you should take the time to block off the ducts just past the last vent. Lots of air is pumped into the front and rear caps if the ducts are sealed at the ends. Another loss is the vents themselves, make sure they are sealed.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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