I think the front end of a 30BH is the same as my 31QB. We almost got a 30BH instead.
I'm curious what the outside temps were. You said it was humid outside, but I wonder if it was cool and humid (so you had the heat on?) or warm and humid (so you had the AC on?)
If I remember right the front of the 30BH is the same as my 31QB. Beneath those nightsands is the propane storage area on the left, and a drawer then the pass through storage area on the right. I bet there is no insulation beneath those countertop type surfaces of the nightstands. I think the insulation package only applies to the rating of the outside walls of the unit.
So, my guess is it was cool outside, and you had the heat on? That would make sense to me because then the countertops would be cooler from the unheated storage are beneath it. As moisture builds up inside the unit, condensation might appear on those nightstands before it would on the walls, since the walls are insulated.
Anyway, that is just a guess on my part, I hope you solve the mystery!
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2009 Sunset Trail ST31QB
2006 Expedition
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