Newer style hub with black cover and rubber cap. Finally had guts to open cap and noticed there is some oil in there but not up to the bottom of the cap hole. Isn't that where it should be?
Thanks
Chris

I think this is what you have. No need for service for 5 years.:grin:
http://ufpnet.com/Portals/0/PDFs/Trailer%20Buddy%20VAULT%20Axle%20Maintenance.pdf