trailer wheels won't turn

I have an older Komet trailer with newer axel. I parked the trailer
about 2 months ago and it was working fine at the time. Now the
wheels are immobile. I even tried to pull it with my car and the
wheels just dragged across the pavement.

In the dark of night I could not figure out if somehow the brake
shoes are suddenly rusted in place somehow or if the shock in the
hitch is jammed.

Both wheels are locked so it would be hard to think that is a
coincidence, the problem possibly started forward in the system.
However the actuation rod that goes from the hitch to the axel is
loose/ can be moved fore and aft.

Behind the actuation rod are the 2 cables that go to the brakes. It
seems that the problem from this point or beyond/behind.

I suppose it is possible there is a problem with bearings or that
somehow the brakes stayed partially engaged on my last tow.

Any suggestions on how to diagnose and fix it? / where to get parts.

Also is there a way to temporarily disengage the brakes, I was
thinking i could take out the brake pads etc.

thanks
Chris
Atlanta, GA, US