Can gmrs and cb share power supply?

Leave the coax in place. you can use it when you can your ham ticket.
Yeah. That thought crossed my mind already too.

another benefit is if I move the GMRS to fender it will clear my carport. So I think add a second coax, and mount to fender is where I’m headed.
 
Sounds like you're on the way to solving your GMRS/CB problem.

One thing I'd like to add is when ever I add a radio to my rig I fuse both the positive AND negative wires to it. It's something I learned from several HAMS and guys that install radio equipment for a living. Since I've done that I've had no power problems.
 
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