Wet hubs are fine for a truck/trailer that is always moving. If the rig sits for months at a time, packed bearings are preferred.
Years ago I was considering a bus conversion, the web site bus nuts had a discussion on wet vs dry hubs.
Me, I had mine packed about year 2, they looked fine. I'll probably never pack them again.
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2012 Ram Laramie 3500 DRW 4x4 3.73 Tow Max Pkg B&W Companion 60 gal RDS aux fuel tank. 2014 Montana 3150RL, 2 A/C's, Leather, 6 Point Jacks, Splendede WD2100XC, Mor/ryde X-Factor, Duravis 250 tires with TST 507RV monitors. 2 x Honda EU2000's
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