Welcome to the forum, Ashville, NC ! !
Your lights work on the 12 volt
"but when i wanted to use the appliance sockets i got nothing"
I assume you mean from this that you are *not* plugged into 120 house current. Your battery does not automatically 'invert' the 12 to 120 for your appliance sockets (110-120volt).
When you uncoil and plug your trailer into AC current, the appliances should be 'cooking'.
This is to suggest the simple answer. Perhaps I missed something in your post....