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All advice above is good. Re-inforcing key points:

1. Carry a spare set of bearings

2. Be sure all tires inflated to 50#, and have wheels balanced.

3. jack up each wheel and spin tire to make sure bearings are tight, with no wobble or rubbing sounds.

4. Since you probably have a spindle lube axle, pump in fresh grease. Be sure rear bearing seal is not leaking (inside of wheel will have grease splatters on it). If so, have seals replaced so you do not lose grease on your trip and fry a bearing.

5. Assuming you have 13" wheels, limit speed to 70 MPH. With these smaller diameter wheels/tires, SPEED KILLS BEARINGS because they are turning so much faster than the car wheels.