Wheel bearing maintenance interval

I think the photo that 'bucky' presented show's and says what we all need to see on a newly acquired unit. I picked the unit in my sig up and with in 20 miles needed a fully out brake application to avoid a accident in front of me. The units braking action was more than adequate for normal driving, although didn't give me a lot of confidence moving forward. I decided to do a bearing and brake inspection before towing again. The bearings had been over packed with the zerks provided and had contaminated two of the four braking assemblies. Bearing were repacked and the contaminated brakes were replaced, braking during a road test was much better.

Long story short, if I had not inspected the brakes and bearings I would have been relying on two brake sets to stop 9000+ pounds of fifth wheel.