Trailer brakes

[bigeasy1]

Well the boats almost finished,but the trailer brakes need to be put back in working order.
It sat in a field for several years,so i know the bleeders are rusted.The steel sections of the line have to be replaced.

So far I put on a new coupler(regular shoe brake one),but now I need to do the rest.I'm only going to be towing it for one long tow of 400 miles to where the boat will live.(fresh water).
Once there it will only be a 1/8 th mile trip to the boat ramp each time I use it,so I'm not that concerned about the brakes at that point.I just want them to safely operate for the long NY thruway trip.

I'm hoping that I can free any corroded parts up so that they will work again,and I may be lucky,and find that it was only the old rusty coupler/master cylinder,that was bad.I know that the trailer has very little mileage on it.Overall,it's in excellent condition.I of course, will be doing the wheel bearings over.

Should I just bite the bullet,and buy a whole new kit?,or should I take it apart and try to get any parts i would need locally.Would parts for these trailer brakes be available from auto parts stores?

I'm probably nuts,here I am worrying about saving a couple hundred bucks,after spending several thousand to do the restoration.I'm not a risk taker,so I will end up doing it right,but I'd hate to spend money on a complete new system,if I can get just the parts that I need from an auto parts store.