Bearing Buddies are a bad Idea, especially if you use the trailer brakes. It's too easy to blow grease past the back seal. If you look through the old forum posts they also say that they are bad news for this reason. Besides the bearings should be cleaned as well as the grease changed every so often. Periodic maintenance also lets you check the condition of the seals as well as the bearings. Just blowing in new grease may give peace of mind, but it's always what you don't know about that bites you. It is the 1.980 (at least on my '75) whichever way you choose to go.
Tom