Seeing as this is your 3rd season with the rig I would take the hubs apart and repack the bearings. After that you can use the EZ lube system.
When using the EZ lube system you are supposed to raise that wheel and rotate it while slowly injecting new grease or you can blow your seals out.
Cheers
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2014 Jayco Swift 281BHS, 300W Solar!
2015 F250 XLT 4x4 Crew Cab, Short box, 6.2 gas
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