Id be ecstatic if the wheel bearings in my Ranger made it that long. I just greased all mine with an awesome new tool from Two Guys Hobby, hoping to prolong their life until winter. Took about 50 pumps each rotating the bearing to get them clean and full.
I will be greasing all new wheel bearings from now on, and if I get a General 4 I'll do them the minute it comes home. The biggest issue with all the bearings (oem, All Balls, ect) is a lack of grease from the start. I understand packing them full can be bad, but where we ride it's the only way to keep mud and silt out. Just be sure to use a high quality grease, I use Lucas X-TRA Heavy Duty in everything with excellent results.
That tool was probably the best $100 I've spent. If any members in the Anchorage, Alaska area want to borrow it just let me know.