When I cleaned, inspected and replaced seals on my EZ-Loader last year I looked into liquid lube hubs, I stayed with grease only because I was already into the job and the bearings were fine. I found that EZ-Loader has liquid lube hubs from their factory in Washington for about $50.00 each if I remember right, if you've got an EZ-Loader I'd think that would be the way to go.
I swore, after the mess of replacing grease and seals, that the next time I'm going to flip for the hubs from EZ-Loader!
Smj