Underbelly Condensation

Does anyone have condensation on the bottom of the underbelly corregated stuff? I wouldn't have even noticed but I was storing a new sheet of plywood under the rig and noticed a small puddle (teaspoon or so) of what looked like rusty water but the texture was thicker than water. Seemed orderless. Further inspection showed what looked like condensation on the underbelly which seemed to be wicking to the low point where a few drops would collect. I am hoping this is not a sign of anything weird. Rig is winterized and has been sitting in my driveway for three months without issue!

As temperatures warm outside, objects like a trailer, will still be cooler than the surrounding air. With that said, warm air holds more moisture and will condensate on any object cooler than the surrounding air.