Karavan Trailers has used two kinds of grease in the past and present. We used Texaco Starplex #2 which is red. We also used Valvoline Cerulean which is blue. We recommend using any good marine grade water resistant grease that has a temperature rating of at least 350 degrees.
We do not recommend mixing greases. If you are to replace with a different brand/type, we recommend cleaning out the existing grease with a solvent before replacing with the new grease.