I would imagine the current air conditioner ducts are designed to give maximum even distributed air pressure to all areas. Probably not a good idea to mess with the OEM ducts... My fifth wheel air ducts was built-in to ceiling foam that separates the ceiling from the roof.
We always made a big effort to always park under a big tree somewhere. Amazing what a little shade will do for you.
Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS
"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"