extra set of beaings -- check
Maddog well south of Boston in Pembroke there is Drinkwater Trailer, they sell and repair.
For trailer parts Monahan's in Weymouth has a good stock, plus knowledgable and friendly folks. (a nice tackle shop to)
Mr.Hunters -- i haven't read the whole thing, but this looks legit.
http://www.geocities.com/palmbeachbo...tructions.html