An easy way to run cable from one end of the trailer to the other end is to go pull down each of the ceiling a/c vents. The a/c foam vents are connected to each other in a straight continuous line. Then you can fish the speaker cables from a/c vent to the next a/c vent until you get to an high mounted cabinet or something that can hide your speaker cables. If you have to exit the vent be sure to use of the spray in foam to prevent cold air from the a/c unit to escape from the foam vent. Otherwise you disrupt the designed air flow pressure for the air conditioner cold air output.
My trailer has ceiling mounted cabinets on both ends of the trailer so i was able to shoot several RG and speaker cables etc thru the a/c ducts between the front and rear mounted ceiling mounted cabinets..
Just a thought for you if you are planning to run some cables from one end of the trailer to the other end...
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"