Pretty well any hitch shop, even Uhaul
will run the brake wire needed on your vehicle for you. You will also want to make sure you have a charge line as well for charging up the battery
when towing and a seven pin connection added to the tug.
Your biggest problem will be finding a small Boler
with brakes already installed - unless you are looking at a newer Trillium such as an Outback.
Most of the axles originally put on older 13' Bolers did not have the plate on the axle
for mounting brakes to. In order to add brakes you will need to put a new axle
on the trailer - that is not a bad thing though as many of the older trailers are due for an axle
change out anyways.
If you have to get a new axle with brakes put on the trailer & are located in the Lower Mainland many owners of old fiberglass trailers have found Escape
trailers in Chilliwack to have the best price and fastest service. Bonus is they know fiberglass trailers well.