If there has been no recent rain or dew, or you haven't washed it, it's condensation. Keep it aired out.
If you want to be sure there are no leaks, wet it down and check the walls.
Outdoors RV Glacier Peak 26RLS Fifth Wheel
Ford F350 Superduty 6.7 Powerstroke
ďStick around please...I may need someone to blame.Ē