You need to be more specific on where the leakage is occurring. Most people have no leakage problems, but some have had major issues.
Also, it may not be leakage but condensation. Lots of newbie hybrid owners don't realize they need to keep a window cracked and perhaps the fan running to draw the moisture out of the air. A few humans breathing plus cooking plus showers, etc. can add a lot of humidity to the air, which then likes to condense on the coolest part of the trailer, which is the bunk ends.
My Roo never had leakage issues. If you can post your specific issue, someone will probably be able to help.
1988 Coleman Sequoia - popup (1987-2007)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10