Sorry for long delay
If fluid is leaking on the outside of wheel it is the hub gasket leaking
if oil is leaking on inside of wheel it is the wheel seal leaking
the oil keeps the wheel bearings lubed and prevents overheating of the bearings
either one is a simple job and any truck shop or truck stop with a shop can make the repair
expect to pay under $200 for either repair for parts and labor
1 hour labor for hub gasket
and 1.5 hours for a wheel seal replace
Normal braking may be reduced some but nothing bad enough to stop your trip,, the longer it goes the more chance you have of burning up wheel bearings and making a bigger mess, if it goes to long brake linings will need to be replaced from oil saturation at additional cost.
Get repaired at earliest convenience
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