custom speaker question for Nick

I want to mount some speakers in the canopy of my truck for when I am grilling out at work. I have a P400 Pyle box at home as well as a custom subwoofer box for a pickup truck (behind the seat). Can I add a mid/tweeter to the sub box so it will act like the Pyle box and mount it in the back of my truck? I could just use the pyle box but the sub box is 1/2 the thickness and twice as high which would package nicely on the inside of my canopy but I have no idea how it would work sound wise.

yes you can ...just seal them off