Wheel bearing Grease
I have not done any trailering in about five years but when I did I used some heavy duty wheel bearing grease at the beginning of each year with new seals.I also had some bearing caps with a grease fitting to shoot some more grease in when ever,but be careful to over grease so as not to blow the seal.I did trailer every weekend from may to sept and one repacking per year was good,the inner wheel bearing is the bearing to keep an eye on if your hubs go in the water a lot,if you trailer a lot more it would not hurt to repack more.You don't want that salt water getting in on the bearings and axle shaft and seize the bearing to the shaft,heavy duty bearing grease is to be used and never had a problem. nick