Backgrounder- Ultralube, EZLube have channels drilled through the spindle. The concept is good, these channels pump grease from a fitting on the end of the spindle, pump in the grease and it would feed both front and rear bearings without having to pull the brake drum and repack the bearings and reassemble.
2015-Bought a new AL-KO/AXIS (now Dexter) axle for the 71' Caravel
before a big 3 month trip of a life-time. It came with 12"drum brakes already assembled. Installed the axle and pumped in grease until old grease was pushed out and set out and put on easily 10,000 miles.
Trailer sits for 5 years until 2020 when I'm prepping for another trip.
Pulled the wheel to check the brakes and found the drums and shoes covered with grease. Rear seals blew on both wheels...hmmm.
One of 3 things things happened, 1. The seals were defective. 2. Brakes were installed badly. Or the seals can't hold the grease pressure when they are pumped up per instructions. I repacked them, installed new rear seals and buttoned it up after a big cleanup. Just passing it along.