Originally Posted by Jim Bennett
I think it is the conception that it eliminates maintenance, at least to some degree. From everything I have heard, not sure I would want it. Of course, as you mention, boat trailers that have their hubs under water at times, could use the flush. As baglo says, maintenance of the regular hubs is not that tough, and ones needs to inspect regardless of what type hub is used.
Jim - I wouldn't want one either, except on a boat trailer. They still are supposed to be inspected every year, same as "ordinary" ones. All they can make possible is to squeeze more grease into the bearing, and quite easily too much. If the seals are working properly, no contaminates should be able to get in anyway and they still need to be inspected each year. To me, it seems like a solution that solves nothing on an RV.
The Dexter Nev-R-Lube system with sealed bearing would actually reduce maintenance needs.