From what I understand these are different from the type used on a boat trailer. I have the "Red Eye" hubs on my boat and as described above I pump them up until it shows full and don't have to worry about them.
Posts here on the forum indicate that the E-Z Lube hubs on the Montana should only be given one short pump a year, otherwise you will over lube and have grease all over your brakes. I have not used mine. Grease does not wear out. If contaminated with water it will lose lubricating properties and should be totally replaced.
It is a good idea to pull the wheels, check the brakes and repack the bearings every couple of years, depending upon how much the trailer is used.
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