[rohrmann]

This has been discussed on other threads, but the bearing service is just a small part of the procedure, the other major part is inspecting the brakes, which should be done at least annually, and of course, the bearings are removed during the inspection, so they might as well be checked and packed with fresh grease. All this can not be done by squirting grease into the zerk fittings. Dexter recommends this service should be done annually or 12,000 miles, but really, with low mileage, it can probably be done every two years, but it is your call and risk if something is wrong with your brakes between this long service interval.