audio upgrade

My 2011 RTL's stock door speakers and dash tweeters have all been upgraded to Infinity Kappas, and I wanted to swap out the sub as well. But, the rear seats seemed daunting, and most posters were saying it wouldn't be worthwhile. I've installed many full systems with amplifiers since the 1980's...

Hi, Anyone have any experience or knowledge if I can swap a RTL-E/T audio into my 2018 RTL....really just looking to do this for Apple car play, but still need the steering wheel controls , backup camera, subwoofer to work, don't really care if the extra USBs are available to work. Would it...