Trailer maintenance

[sleepertruck72]

I am replacing the rear wheel cylinders and axle seals on my C-20 and it made my think of doing it on my C-20 trailer. I dont think it needs to since the brakes arent being used on the trailer.They dont seem to be leaking or anything, but then again it would be hard to tell since it is used every now and then. It doesnt have any obvious signs like my daily driver. It loses fluid in the master cylinder and left some stains on a driveway one day. Should I do anything other than replacing the fluid in the rear end(which I already did). I eventually want to replace the axle (Dana 60) with a straight tube 8 lug trailer axle just to save some weight and have a spare axle. But that can wait.