It COULD be condensation. I assume you've got the PUP vented somewhat, to prevent condensation on the tent material, but if there's an area where the air isn't going to flow much, that could be the cause.
There are 2 or 3 threads going on right now regarding condensation. This is the time of year that those treads start coming up.
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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