OK - I'm going to assume that if you are on a permanent site you are plugged in. Actaully not an assumption since you said you have an electric bill...
The solar panels will produce power, but you need to store and regulate it. There is a fair amount of calculating you need to do to match your battery size to your panels, to your power needs. Then there is the fact that the solar panels are producing DC current, and many of the systems in your 5er are running on AC. So, you need an inverter to change DC power to AC power. Its the opposite of your trailer's converter, which is taking the 110V AC power and converting it to DC power for your lights and other 12 volt systems.
So, if you have an inverter already, and its wired up to power your TV and other 110V items, the solar system could certainly save you some $$. What you most likely need to do is actually unplug or flip the breaker on your incoming electric (shore power) and run off the batteries, with the inverter supplying the 110V stuff and the panels charging the batteries. Then, you use the incoming electric ("shore power") like you would a generator. If you needed to run high current drawing systems like your AC (edit - used AC for 2 different meanings, air conditioner in this case), its too much for the battery system. Or if its winter tiime and cloudy, the batteries may get low. In those situations you turn on the "shore power" and the rest of the time you only run on your batteries.
Unless you have the ability and the utility allows you to do "net metering." Then your panels just offset part of your bill. Not 100% sure if/how that might work in the case of an RV. Its common in houses in states where that is allowed.
If you post some details about the specific system you have - wattage of the panels, what charge controller, what inverter - it would make it easier to give you some more specific advice.
And, if you do a google search, you can turn up some blogs and other info about people using RV's "off the grid" with solar sytems to meet most of their power needs. Here is one link that goes through some basics about solar for RV's:
Solar RV Panels – Camp Anywhere In Style - Solar RV Panels