jason, does yoru trailer have brakes? the axles with brakes ( hubs) will be slightly warmer. Teh hubs will be somewhat warm, but not hot. IF they are hot, somethig is not right. I belive there are front and rear seals...maybe the front seal is bad and letting grease escape thru it.
PS I hate bearing buddies and greased bearings. Oil bath bearigns are so much easier to deal with and I have never had issues with them, only bearings that use the buddy bearings have I ever had issues with.