Just finished this little project on a Trilly that was purchased 6 mos ago, and to be honest, being a newbie, it was more work than I anticipated even after watching online videos, but it worked out well in the end. I am glad I did the job as the trailer really needed this complete service . It had not had the hubs repacked by a shop in 5 yrs, though one hub looked like it had recently been regreased which, as it turned out, was not enough.
The difficult parts of the job were:
(1) getting the correct rear bearings/races at Napa ( initially given the wrong ones even though I brought in the hub as there were 2 choices). The correct rear bearing/race was part no. BR13, front BR4, both made in Japan; the rear seal and front bearing were simple to get as there was only one choice ;
(2) getting the rear seal out was difficult, even going at it from the rear, in an attempt to avoid damaging the rear bearing ( damaged one of two ) . If I had tried to knock it out from the front, it would definitely have damaged the rear bearing.
(3) the rear bearing races were hard to get out and even harder to get in. It was a lot of pounding with a big hammer, using an 9" punch to get them out and straight pvc connectors sizes, 1" and 2" , to drive in the races, as they were the same diameter as these pieces.
(4) it was a mistake on my part to think I could get away with just removing the rear seal, replace it and clean/repack the existent bearings. As it turned out, both rear bearings showed signs of wear, and needed to be replaced which meant also replacing the races.
(5)It seems the going rate for repacking the hubs of a 2 wheel trailer is $150 labor. I don't know if this includes putting in new bearings/races.
(6) The price for parts is: rear seal FI 171255TB x2 $7.18, rear bearing/race X2 $26.88, front bearing/race X2 $24.88, for total of $58.94. Replacement cotter pins were cheap at $0.10 a piece. I had forgotten them on my first trip to Napa.
For someone not so adventurous who knew a good mechanic, could have the job done at their home or close-by with easy parking, would do the entire job ( 2 wheels, replace bearings/races and repack ) for $150 labor plus parts, I don't think you could go wrong.
Personally, I like challenges and learning new ways I can care for my Trilly, and didn't know a good mechanic or have a place close by to go to if I wanted to have someone else do the job. I was skeptical that just anybody would do a good job as I had recently seen a mobile repair person pack a rear bearing on a Class A when the rear seal went bad and didn't do it according to the book.
Hopefully, this info will help someone redo their hubs on a vintage Trillium
and same themselves a 2nd trip to Napa for the right rear bearings.