Stripped hubs brakes etc. and found everything in great condition, except for a few cobwebs, but went ahead and repacked the hubs anyway with waterproof grease. This trailer is built like a brick s/house.
Being not familiar with overrun brakes w. handbrake so Googled and found the following.
Excellent info. and a lot more to choose from on the home page.
Discovered a useful trick in the process. I wanted to make sure the hubs were fully packed and I have a grease nipple on the dust covers ( no bearing buddys) I did not want to empty out my greasegun to change grease. I ladled lot's of grease into the hub and dust cover and started to tap the dustcover back into place. It would not go all the way back in because the inside had too much grease. kept tapping with a mallet for a few mins. and then removed the grease nipple and a nice squirt of grease came out. wipe off and tap dust cap fully home and replace nipple. These hubs are now full, unless there is an air bubble in there!.