Not sure if you have Ez Hubs or not but check to see if you have a rubber cap in the center and have zirk fitting behind them if not pull the metal covers off and see if you have a zirk fitting behind that.
you should always check the hub's atleast once a year and verify you have grease.
I had a trailer that wiped a bearing out - had to replace it on the side of the road after it cooled off - lets say it wasnt fun but it got me home and had to tear it down and re do the bearings on all 4 axles.
Norther tool sell's the pre [acked hubs or just the bearings with seals - cheap cost of insurance for me since I have enough tools to do the repair on the side of the road.
2011 Rockwood Mini Lite 2306 - Matt
2004 Dodge Ram 1500 Qaud Cab 4x4 with 35" tires and 3.92 gears, Dynatech Longtube Headers & Fabtech 6" lift + Superchips with shift Tuning
Nights Camped 2011 (37) - 2012 (16)-2013 (2) -2014 (5) -2015(0)
USMC 91 - 95 - F/A-18 Aviation Ordnance