So I'm in the market for a soft tonneau cover and was looking for some opinions from other members. Right now I'm looking at the Truxedo Truxport and the factory GM soft tonneau. Any opinions on which is going to be more secure and weather tight? It can get pretty wet down here in Florida and I need to make sure the water stays out. Can't seem to find too much info on the GM tonneau, how does it latch? I'm looking for something that can't be opened with the tail gate closed. Thanks in advanced fellas.