Had the same problem here. We used one of these...
I installed it in the cabinet where our outside radio is loacated. I use a set of generic box speakers and about 20 feet of wire. Since our outside stereo is located pretty much dead center on our rig, I did not want to run wire to the front and rear and install separate plug/jacks.
Also, food for thought: We have built in outside (round) speakers that are set pretty high. The stereo also has a set of speakers in the outside stereo cabinet (built in). Both are controlled by the "fade" front/rear option on the stero. However, when the upper speakers are on (after a hard ride and coors light), you can't hear at all inside (crappy installation on the Keystone Raptor). I pulled out the stereo and changed the wiring around so that all four of the speakers are considered fade - front while the box speakers are controlled as the fade - rear.
I pretty much only use the fade-rear (box speakers) because they sit on the ground and nobody in the trailer gets directly victimized. Below is a link to an electronic shop that has all sorts of cool jacks. Most local shops cary them too. Radio Wall Plugs & Jacks
I had a similar problem with mine ... I wound up digging into and rewiring the whole speaker system. The guys that wired these things were definitely not sound technicians. They had ignored the "+" and "-" markings on the stereo, subwoofer, and speakers, both indoor and outdoor ... this caused ground loops which killed the quality and volume of the whole system. Major PITA to rewire, but it was well worth it.
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