If you follow the piece that curves down to the bottom, is there any "extra" down there? Seems like it should be pushed UP so that it closes up the gap better. Doing this may or may create another issue at the bottom.
Also, if the gap is only on the inside, it's probably not as big a deal, either; it's somewhat protected up under there.
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