John's advice is very sound. Not only try to exercise every switch, dial and knob to make sure it all works, but probably more importantly take the time to understand your systems, not only to assist you when you have to figure out which switch the kids pushed to make something not work, but to help you cope with a problem if something really doesn't work as it should. When you know what you don't know (such as how to make the slide go in manually or how to get power to the refrigerator if the inverter has failed) go over these things with Liberty. Far better to do that now than to find out at midnight on a Friday of a long holiday weekend that you cannot get hold of anyone when the awning is hanging out and you want to drive.
Not being a pessimist, but a realist knowing stuff happens and nothing beats having a plan for when it does. If anyone tries to tell you nothing ever breaks or when it does you can always get telephone help find out what kind of recreational chemicals they are using.
As to the space lost by the OTR...try not to drink that cool aid. You have lost less than the equivalent of 1/2 bay because between the condenser side and the evaporator side is the fuel tank. And typically those coaches without OTR do not make the efficient use of bay space that you have in your coach. I don't know of another converter that gets the generator, the waste tank and water tank all in the same bay.
BTW, in case you haven't figured it out note the other Liberty owners on this site and establish a rapport with them. Often they will be able to give you a lot of help and advice because they have learned and experienced what they know and will be willing to help you with assistance if the need should arise.