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It is a 12v fixture, I can find the bulb number if you would like.
This is the bulb you would need: http://www.campingworld.com/shopping/item/12-8w-f8t5-cw-replacement-light-tube/75223
The light itself is not avalible from Camping World, although you should be able to order it from any RV center. Or on Amazon here: http://www.amazon.com/Thin-Lite-D742-Fluorescent-Light-Lens/dp/B007HRXT7K/ref=sr_1_1?s=automotive&ie=UTF8&qid=1444417733&sr=1-1&keywords=thin+lite+742