I just got my hands on a used 24' galvanized roller boat trailer... Seems that all 64 rollers are siezed and rusted out.
So I am in the middle of using my sawzall and hammer to break loose all the wheels. Each wheel has 2 washers that are rusted out and just crumble when hit by a hammer.
I have to buy plastic wheel inserts, galvanized 5/8 bolts, washers, and nuts... only there are not any 5/8" galvanized lock nuts in town so I have to use loctite or a loc washer. The alternative is a $3.95 stainless lock nut.
But to put things into perspective, a new boat trailer is $7-9 grand!
Lesson Learned: only buy used bunk trailers