Just purchased 2015 DCLB Sport and putting on a truck cap with plans on sleeping in the bed on camping trips. With a new truck cap and properly sealed, it should be a dry compartment. I am consider plugging up the drain holes in the bed of the truck and storage bins to keep water from splashing up through the drain holes when driving in heavy rain.
Being a newbie, this may not be the best way to go, appreciate your opinion if you have experience with modifying the drain holes when using a camping shell. Thanks