Always remember that marketing hype exceeds common sense sometimes. Anything easy or maintenance free has got to be a disaster in the making at some point. Bearing and wheel maintenance in general is just another part of the RV experience. If the salesman can tell you part of it is no longer required it will make you want to buy the product. If I had never lube bearings on a trailer I would replace them about every few years or so depending on miles towed. Remember, you are the one beside the road with smoke coming from an axle, not the salesman or engineer!!!