We don't have that particular unit but our 5r has outside speakers. Most posts that I've seen from members say the same thing... outside speakers aren't any good. Rather than incur the cost of upgrading our outside speakers, and potentially becoming a nuisance to our neighboring campers with our upgraded sound system, we bring a DeWalt job box radio. It's fairly lightweight, very portable, can run off ac or dc power and it has an auxillary port for the ipod. Works great for us!
Kevin & Janine
2006 Dodge 2500 Megacab CTD 2WD
2012 Palomino Sabre 32RCTS
Pullrite Superglide 16K Hitch