Hey sdxtech, this may be more overboard than what you're thinking - but actually isn't that hard -
https://www.forestriverforums.com/fo...od-214172.html
That little amp that I put in there has Bluetooth - I connect to it from my phone or laptop that way.
IDK what head unit was in your trailer to start, but ours has a square form-factor Furrion unit that realistically can't be replaced with anything...if yours had a normal DIN-style unit, probably a lot easier.