Looking for a bearing grease I can use in all my trailers. I have a ski boat, travel trailer, and utility trailer. Would like to just have one rather than juggling 3 different kinds, if possible. Any suggestions?
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OP, I work with lubricants professionally, and you do have some options. As has been mentioned, some of the challenges you face in selecting a grease come from incompatibility between bases, and trade-offs with what one grease is designed to do over another.
For your application, your primary concerns will be avoiding water washout, and having some additives in the grease that will help with the shock loading on your bearings that come from heavy loads bouncing on dirt roads or rough surfaced streets. Corrosion protection should be fine with most common greases, but will take on added importance if you're around any ocean environments, or spend time in winter areas where salt is used for de-icing roadways.
Regarding grease incompatibility, almost everything you'll find at a local retail store will be engineered around either a lithium or calcium thickener, and I'm not aware of any cases where those are not compatible with each other. Avoid aluminum and clay-based greases - those have a lot of incompatibility issues, and are best selected for very specific or specialized performance needs. Aluminum tends to be excellent in avoiding water washout, and some of your best high-temp greases are clay based, but avoid both here. Regardless, I'd still highly suggest you remove your old grease from any surfaces before applying the new. It's good best-practice.
The best I can suggest for your application, that is commonly available at a local retail store, would be WD-40's NLGI #2 "Specialist True Multi-Purpose Grease" / "Specialist Heavy Duty Grease" (same thing, but latter is the new package and name). WD-40 is fairly new to the grease market, but they knocked it out of the park with this grease, and it has some genuinely uncommon combinations of performance properties. I've seen it at both Home Depot and Lowe's.
