Hi guys,
Please be reminded that if you have “top up” the fluid it means you have a leaking wheel seal which could be contaminating the brakes. (Unless it’s leaking to the outside which would be quite obvious.) Gear oil doesn’t evaporate.
Monaco service interval for steer axle bearings (grease) is 50,000 miles, so once you service them you can basically forget about it for a few years in most cases.
Just my 2 cents.