I would try a local-to-you trailer shop. Doesn't have to be a boat-specific place.
Most trailer places here in Texas can cover/work on just about any trailer.
I lost a bearing on a trip down to the coast a few years back (almost 200 miles from home - return trip) and we were very lucky we noticed it while sitting at a gas station - we had already traveled 26 miles! The closest trailer shop was 18 miles away and they were able to rebuild our hub (spindle was ok, luckily) without any problems. I've since replaced the other hub with new parts from a local trailer place here in San Antonio. The only thing they asked was if I knew the axle capacity. (Btw - I have a 5000 lb single axle with 6-lug hubs w/ 12" surge brakes - not your typical trailer axle by any means)
If you can get the trailer to a local shop, they can probably take care of everything for you right there. Even with the boat on the trailer, since you're not that heavy.
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1999 180 Horizon OB Fisherman Pkg
San Antonio, TX
Choice of tow vehicle:
'93 Explorer 4x4 (sold)
'05 Grand Cherokee 4x4 w/ 5.7 Hemi (member of the 240k+ mile club!)