In 2016, almost all Keystone products had switched to TPO roofing material. You can verify yours by removing the molding from the bathroom vent. You'll find the membrane stapled to the framework. Pull a couple of staples and inspect the membrane. If it's black on bottom and white/beige on top, it's EPDM. If it's the same color top and bottom (white or beige) it's TPO.
As for venting, some trailers have attic vents (typically two 2" vents, one forward and one aft) which will, in an extremely dry environment (think southwest desert) will allow any trapped moisture to escape. If you had enough water leak through the TPO membrane that it saturated the luan ceiling panels and dripped into the trailer interior, you've got a substantial amount of water trapped between the membrane and the ceiling luan panels. A couple of 2" vents in a 35' trailer roof won't allow any substantially wet areas to dry, especially in a humid location.
Essentially, the purpose of those "little vents" was to allow the attic space to remain at or close to the outside temperature so any trapped moisture wouldn't condense on cold surfaces and lead to damage. They aren't going to vent enough air to "dry a wet interior in the attic".
Eternabond tape, when the edges are sealed with DICOR sealant, is considered by most people to be a "permanent repair"... If you've ever tried to remove Eternabond, you'll know why......
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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