no maintance battery

bgant4 wrote:
I have a cedar creek with a standard battery. It has a batt. Charger no converter. Can I use a maintenance free batt?

You have your terminology confused, you have a converter, just not an inverter.
Converter: 120VAC to 12VDC Powers 12v appliances when plugged into shore power.
Inverter: 12VDC to 120VAC Powers 120v appliances when shore power not available, runs off of battery.

If the trailer is a late model the converter should have multistage charging and will do fine with an AGM.

AGM: Absorbed Glass Mat, a sealed battery that is maintenance free.