You do have a leak.
Fill a spray bottle with a soap/water mix, air it up to normal and then spray as many connections as you can reach.
If you see the air line near the frame spray it incase it has rubbed a hole in the line.
And spray the bags as well.
2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
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