Sorry I don't have any pix, but I have made many CB mounts that simply sit on the tranny hump . 2 boards , one flat on the hump, the other screwed either vertical or at an angle. Mount the CB on that board. It can sit there, on the hump, against the seat within easy reach. I power mine using a standard cigarette lighter plug or the aux power outlet (they are fused). Some velcro on the bottom of the board will help keep it in place. I also have an external speaker mounted on the case to make it easier to hear.
I have run with a CB for years. I find that most Airstreamers have them so when you run up on someone on the road it's great to be able to say hello, and if you happen to be traveling the same direction the company is always good. It is really a must for traveling with another rig. The unofficial official RV channel seems to be 14. Truckers use 19.
Wilson makes a good antenna, and the magnet mount type, sitting in the middle of the roof, will do you a great job.
Good luck, and safe & happy travels.
Region 3 , 1st VP
Go often to the house of a friend, for weeds choke the unused path........Emerson
Never pick a fight with an old man. If he is too old to fight he will just kill you........a wise old man.