I think NevRLube is a proprietary name for the oil cartridge bearings that Dexter recently optioned in it's #10 and up axles, I believe using a six-lug hub and 16" wheels as a minimum. Generic cartridge bearings have been around for a while in automotive use (For example, I believe my '93 Saturn had them). It makes sense to me that a rental company would want an axle system with the least amount of maintenance required and cartridge bearings certainly fill that bill!
EZLube is Dexter's name for the lube system where a zerk fitting in the center of the hollow axle spindle is used to pump fresh grease thru the spindle to emerge between the seal and the inner bearings where it makes its way thru both sets of bearings back out to emerge near the zerk outside the spindle -- Other manfs have roughly the same system by different names -- Sometimes very erroneously confused with Bearing Buddies.
Here's an animation of Al-Ko's version of EZLube called A G Lubrication.