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Old 09-03-2012, 01:47 PM   #10
f6bits
Senior Member
 
Join Date: Nov 2011
Location: SoCal
Posts: 1,739
My trailer even has a furnace duct that runs into the underbelly. I think that’s a futile effort, so I blocked that duct at the furnace.

Keystone also touts the underbelly covering as aerodynamic, so I vote for A&B.
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2011 Passport 2590BH
2009 Ford F150 SuperCrew FX4 5.4L w/Max Tow
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