Those hubs have made multiple cross country trips.
The reason these hubs go out carrying so little weight is due to neglect. I would clean and repack the bearings for long distance trips, the one time I didn't turns out water had gotten into the hub and could have caused them to fail, but that's nothing to do with the bearings and tire size, I was in a hurry and cut corners. Trailer bearings need to be redone every 2 years, last time when they could have failed on me it had been about 3 years.
In a wet place like portland, you should probably clean and pack them yearly.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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