Thoughts - you gotta do what ya gotta do and if mama's not happy nobody's happy. And red is the best color, just say'in.
As far as getting out of the car your 'upside down'. Owe $55k and wholesale or dealer trade with those miles, needs tires, and no AC. My best guess is mid $40's on a '14 based on auction results. Trying to sell for $50k may take some time, still a lot of new and used inventory out there. Your also coming into the end of the driving season, last half anyway. It's going to cost $7-10k to get out quick.
Good luck. Hope you can sell privately, that would be your best bet. One thing to hang on to the car longer is advertise it and put a big price on it. You'll keep everyone happy if you know what I mean.