With everything tucked in when the roof is latched there really isn't anything there to leak around the roof edge seal.
This leaves the air conditioner if installed or the fantastic fan if installed roof leaks???
Maybe the roof doesn't come down level all the way around it. Might need a roof raise bar alignment... My roof has a half-inch lip that goes over the bottom sides when in the down position. No way that would leak on your unless warped out of shape. My four roof latches are spring loaded and snapped into place held with a lock lasp. You can see the lock lasp here in the photo to the left of the running light and the word STARCRAFT... One of each of the roof corners...
There is a weather seal associated with the main access door. This was a leak I had a problem with on mine where water would get inside around the bottom seal of the side access door and accumulated on the floor on the inside.
I also had weather and bugs problem with a poor designed seal that goes between the pulled out tent bed wood floor and the solid end walls of the trailer on both ends. When pulled out you could bend over and see daylight thru the seals. This seal is just behind the aluminum strip you see here between the tent bed and back wall.
I fixed that with a better design rubber seal like this cut and glued on the top of the inside end wall under the tent bed wood platform.
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS