I’m a little unsure of which question(s) you want answers too. The motor you have is a permanent magnet type. It will turn the same direction however the polarity is hooked up. The technicians you spoke with need to find another type of work.
Are you changing the polarity of your truck? If so, ask how to do it on this forum and someone like Jerry and others will show you the ‘path’.
I know of no “internal control components” that would be effected by the reversal. Your radio has a ‘chopper’ in its front end and I am unsure about and the polarity of your filter capacitors. That question can be asked in the other section of the electrical forum. Reversing the wires on your amp meter is a ‘no brainer’. Hope this helps.

Six volt guy living in a twelve volt world