Hi Mike, sorry to hear that, you're lucky only one locked up
I had it happen several times to one Two and all four locked up
Always serviced and bearings and brakes all replaced in 2nd year, happened again last year all four on a gravel lot, jack it up and pound on it! Not fun
Really a pain if it happens in a remote place
My mechanic suggested to whack the backing plate with a hammer to free them
If you have the stock Road Runner trailer that PBH puts under the CD I'm sorry bud but you will be changing to Titan or Kodiac discs at some point, RR brakes and hubs are so so ( I told 'em so too!)
We changed out to Titan discs last Fall kept surge/disc
Much more robust gear, the 1 year old brake shoes had all crumbled to bits (work done in Yuma Az, not taking it back to fix)
The RR guy said these trailers were more for average type weekend use not long haul as I specified
Our trailer is good now, $2600 for 4 new hubs, disc and actuator, much I mean a Lot more stopping power as in right now baby! No lock up when left
George