The "EZ" in the name is a great sales promotion banking on the human nature that people these days are inclined to take the "EZ" method of maintenance. As my Dad always reminded me "take care of your equipment and your equipment will take care of you" Early in life 20 years plus of semi's and heavy equipment. Then a turn in life and 16+ years depending on my patrol car and I learned that Dad was 100% correct......I always practiced what he preached.
Doing it the "EZ" way keeps a owner from visually inspecting bearings for signs of excessive heat or wear. Shooting new grease in to chase out the old grease eliminates a visual inspection of vital parts.
Many new and prospective RV owners today are not use to getting their hands dirty. Proper PM by a owner requires some effort, dirty hands, time or finding a qualified mechanic to do it for them. For those who don't have the ability etc. I would recommend your local dealer that sells livestock trailers, farm equipment, truck repair etc. They're use to dealing with bearings.
Doing things the "EZ" way and the best way are usually two different things. The things I will not overlook, skimp on, or take the "EZ" way out on are tires, bearings, brakes.
Of course I am "old fashioned, over the hill, not in touch with reality" as my kids like to remind me of