[dennis461]

I do not think the type of grease matters much; if brackish water is inside. I now simply consider my bearings disposable, thus keep two spares and all necessary tools with tow rig.

I tend to open mine up when trailer returns to home base, let water drain out if any is in there. Leave the cap off to allow drying out until a few warm sunny days have passed. Then stuff more grease in on top of old, and re-install bearing caps. My towing is 20 miles to nearest ramp, expressway speeds.