Where you looking to mount it? Ceiling, floor, dash etc. and how big a radio? My favorite mount is a floor mount that a guy made me years ago out of a piece of aluminum on a break.
I like these because the brain can be mounted somewhere out of the way, then you plug in the handheld portion when you actually want to have a CB. For most around town needs, you won't use it.
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2013 Coachmen Freedom Express 320BHDS pulled by a 2005 F250 King Ranch CC
A rainy day camping is better than a sunny day at work.