Luckily we have a seasonal site with a deck. So I cut the outside speaker wire and pulled it through the bottom of the camper. Then I mounted Yamaha outdoor speakers on the deck and it rocks the campground!
FYI we are at a private campground with the one rule "Do not make us make rules!". It was started by a bunch of Irish folk who would get kicked out of regular camp grounds for noise, fire ect. So here we play lots of music and have very big fires into the wee hours of the AM. Its not for everyone but everyone there loves it! We are like a big seasonal family!