Or if you are cheap, lazy and reluctant to drill holes in your RV, just poke the wire in through the slide seal.
I would want a permanent install using a surface mount solution, such that a square hole doesn't need to be cut in the wall, just a small hole for the wire to go through. I'd want to install in an area that backs into a storage compartment, and from there I'd tend to want to drill through the floor and not the sidewall.
My phone would be a two phone wireless kit, so I'm not running around falling over stuff trying to get to one phone in the middle of the night. Radio Shack usually has a good deal on a kit like this near Christmas.
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2008 (or is it 2009?) Rockwood 8280SS - 2007 F-150
Lot's of mostly Kenwood radios