For most RVs greased hubs are a better option than oil bath hubs, and for the exact reason you mention. While it is obviously not good to run your greased hubs without a full load of grease, this tends not to result in catastrophic failures, mostly accelerated wear and higher operating temperature. Oil bath hubs are less forgiving of leaks and they tend not to do as good a job as greased hubs at keeping water out of the hubs.
If you check out RV forums on this subject you'll probably find... view full answer...
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