Could be condensation. High humidity in Fla? Sometimes if it's super humid outside, it'll condensate. Our TT A/C will sweat like crazy if it's really humid out (90-100%). More around the unit itself than the roof vents. Pulling very humid hot air into the unit then blowing it into a nice cool dry cabin will make it sweat at the vents. At least that's the conclusion I came to. My buddy's Shadow Cruiser did the same thing last time we were camping.
2013 Jayco Eagle 328 RLTS
2012 Ford F250 6.2L 4x4 CCSB W/Air Lift air bags
2002 Coleman Bayside Elite (traded)
Me, Momma and Charles (RIP buddy)
And introducing Sofie!! ;)