I use a MilSpec spray lube and hit my bushings every month or two. I'm in pretty good shape since I don't even get my rims wet when launching/retrieving (little boat, probably not possible with anything other than a single axle trailer). When the hull doesn't drop cleanly off of the trailer at launch it's time for the spray. I'm certain it acts more as a cleaning agent than a lube. I'm at the ramp as much as 200 days a year so mine gets lots of use.
__________________ Tight Lines
Capt Bob LeMay
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