Bearing Buddies are not
the answer. They are Great for boat trailers, I have been using them for 50 yrs. or more & have them on my boat trailer today. They do not
push grease out the rear seal (that is not how they work) unless....#1 the grease seal is worn or #2 you force too much grease in the BB. I have never had grease come out the rear seal, only in the case of #1 or #2.
EZ lube hubs came on the QUE & I guess many other Sunline TT. They are GREAT...IMHO
I don't know if you could put the EZ lube hubs on without changing the axle ? I am sure John and others here would know that.
This is a cut away view of a EZ lube hub & it shows how it works, the new grease goes in all the way to the rear & and forces out the old grease out the front.