I posted a photo of my UltraLube experience at //heartlandowners.org/showthread.php?t=3387.
When you pump grease into the fitting it goes through the axle and exits out a couple of holes near the rear bearing. If the rear seal is working properly, the grease will be held in the axle area and will fill the voids around the axle until sufficient pressure builds to force the grease forward to the outer bearing and to force grease into the bearings. If you place a few squirts of grease into the fitting it does little good and will not help the outer bearing.
Disassembly and repacking is a much better method of maintaining the bearings than to rely on the UltraLube system to keep them properly lubricated. It is not any more difficult than a standard bearing system. I would squirt some fresh grease through the fitting while it is disassembled to clean out any old grease that might be in there.
NOW I READ SLAYTSOP EXPERIENCE!!!... Purchased Bighorn in October '06. In the next ten month the BH was used for three trips totaling 6,000 miles. It then went to dealer for warranty work and repair of china bomb going off on last trip. Got it back in November '07 with no trips until April '08 for the recent. Heartland Owners Rally in Houston. Followng rally dropped the BH off at Camping World for wheel bearing repack and brake check.
Well now.... I had followed the recommended procedure for lubrication of the UltraLub system and used hand pump to inject grease until the new grease begain appearing at the front of the spindle. I had done this in June '07 before last trip on which the tire blew-out. Did it again about six weeks befor rally. (Sorry, hit wrong key... probably still shook up from UltraLub Experience. Like Slaytsop experienced... mechanic at Camping World found both OD side hubs full of grease (has not removed DoorSide wheels yet, likely to be the same). I recall thinking that it seemed the hub was taking a good amount of grease, but as I was following directions felt that all was well and trusted the design of the system. I now have to REPLACE all brake componets due to the amount of grease coating the brake plate, shoes, magnets. IMHO, like Slaytsop, the concept of the UltraLub seems good... but, as a practical matter if you have to rremove and inspect the bearings, hub and replace the seals every SIX MONTHS... what is the value or use of the UltraLub system???!! Now I am obviously not a mechanic, but I can do a reasonable job of minor maintenance and generally follow written instructions. It seems that I must now institute maintenance to include repacking wheel bearings and replacing the seals at least every six months. WHAT A DRAG...