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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-Scott, DW, DG, DB, and DD
2011 Passport 2590BH
2009 Ford F150 SuperCrew F X4 5.4L w/Max Tow
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