Anyone upgrade their interior and exterior speakers?

I'm going to replace my speakers. Also, I have a 3rd channel a, b, (c) I'm going to add a portable 10" sub with a built in amp. My plan is to have a plug under the trailer. When we get to camp I'll set the sub just under the trailer on the patio side. It'll be portable so I can just unplug and put it back inside. It'll add a good range of low base to the system. Not going to blast out the neighbors with hip hop or anything just want to add some definition.