You're doing us an awesome service by sharing all this great info. Thank you, thank you.
I'm Rv'g now with a 5th wheel & stopped planning on truck mounted access. for lack of good looking switch mounts. I've got my aux. tank pmp & Banks Brake switches 'stuck' in the lower dash panel on my '04 3500.
Now I can plan to add aux lights at the RV wheels to keep from running over bushes at night! This then brings up a related question: Where can I obtain "key fob" type transmitters for wireless control of some RV functions like aux. backup lights, side lights above the wheels, etc.