Your Liberty is set up to accept a 30 amp service. Remember a couple of things. First a 30 amp service is going to work just fine for up to 24 amps, and over that the breaker might trip.
It will provide power to both legs in your panel, but you really have to consider your coach like all late model coaches is an energy hog. Reset your inverters to a low current draw. If you use a lot of lighting they are going to draw what they are set for so if they are set for 30 amps you are going to trip a breaker.
You have loads beyond your control and you need to be aware they draw a lot of juice. Look at the load your water pump and aux compressor draw. Add in the refrigerator. If you want Webasto heat or a cruiseair or you want to watch TV or heat water you are likely tripping or on the verge of tripping breakers.
Others may disagree, but before I even consider using 30 amp shore power I am going to fire up the generator and live like a king with all the comforts my coach can offer.