MJ, My LR has the same rubber covers. My trailer is a 95' and I only greased 2-3 times a season. Once a season now that I am in a slip.
I think they keep the water out and grease in much better.
~..~..~.. ><((((º>
Things done at the last possible minute are done with the greatest possible information. Procrastination is, therefore, the most efficient means of doing things.