You are talking about bearing buddies. There do work well keeping the outer bearing greased, but for them to get grease to the inner the hub would have to be packed solid. This would cause the hub to over heat. They can put pressure on the inner seal and weap a bit.
I ran them on the boat trailer and have gone back to standard packing and cap. This way I can check the bearing condition at the same time.
If you want to try them you can use mine for a while.
Cheers, David.
My Land Rover has made me a better Mechanic........
D2 TD5 Manual, CDL, Detroit Rear, Truetac Front, 2" OME lift, 32" MT Tyres, ARB Bull Bar, Winch, TJM Roof Rack, Driving Lights, Dual Batteries, ARB Side Steps, Rear Draws, Uhf.
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