Hard to say from where I sit but if you have a truck stop nearby you may have a CB shop nearby, also. Or at least you should be able to by a SWR meter at the truckstop to tune the antenna. They probably can't service the CB itself, but may be able to determine if the mic or antenna is causing the problem.
Don't forget 27.185 while you're out there. Not all of them are filthy reprobates!
2013 V Star 1300 Deluxe
OEM Tall Sissy Bar
Memphis Shades Fork Deflectors
Bridgestone Exedra Max Belted Tires
Baron's RSTD 7308 bar