Upgrading from a 13.5K BTU to a 15.0K BTU air conditioner

Thanks for the answers everyone. We are a 50Amp and pre-wired 37' Titanium (that company is out of business). I just wasn't too sure if plug and go or if I had to get new harnesses. Glad I won't have the extra cost as I will be doing the work myself.

They are Dometic Brisk II. The 13.5 is a bit on the noisy side and the wife won't like that in the BR (I've been down that road already). We currently have a rain vent in the BR which is nice and I suggested that we could move the 13.5 into the kitchen.

Thanks again.