Is there a storage bay right above them?
If so look inside for a false panel, which may have 2-4 screws #2 robertson drive type.
If no storage bay go inside to that area where the tubes are look for a false panel there, or under something.
2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." 2014 19 days camping 2015 17 days camping201620 days camping