On a tow that length, if you don't know when the last time the wheel bearings were packed, I would suggest you take an hour and prep them. I used to take the time to do this when I would recover CMPs, and often as not I was glad I did. It doesn't have to be a great job, just disassemble, quick repack, and reassemble with the same seals. It is just so you don't have any incidents during the trip.
Just the front bearings of course, you can top up the grease in the rear wheels with a few shots of the grease gun. You may have to bring grease nipples for the rear, as there was a mod to remove the nipples and manually grease those bearings.
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