Agree with gearhead that it looks like the center cap should come off, but best to pull the wheel and verify from the backside. As already mentioned though, once you pull the wheel and pack the bearings properly, they shouldn't need to have grease added through the EZ lube fittings so no big deal if you do or don't have them. Wheel bearings on RVs can be looked at the same as front wheel bearings on older cars, ever see one of those with grease zerks? Boat trailers, as you already know, are a much different story.
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Brent
2013 Alpine 3500RE
2019 Silverado 2500HD Duramax
U.S. Air Force Retired (25 yrs)
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