My 2011 tandem trailer has the Vault hub system on all wheels. I've already had 1 go completely out and almost mess up a spindle. I now have one tire leaning in at the top, causing the tire to wear on the Inside. I've checked for play in the hub and only had a very small amount vertically. I pulled the cap off and tightened the nut up slightly. There was a few drops of water in the grease, which tells me it's time to repair the hub assembly/seals. The cheapest I've found the Vault service kit is $65, but it is only the grease, the caps, 2 o rings,some loc tite, an installation tool and a zerk, no bearings, races or seals. I've considered changing the type of lube system to a regular EZ Lube type (there's a zerk fitting on the end of the spindle), a Vortex system, or a bearing buddy. Has anyone here changed their hubs out to one of these type hub systems or something else? Or should I just go back with the Vault system?