i currently have a single axle roller trailer without brakes for my 22ft starcraft islander...i am looking at a double axle with hydraulic disc brakes on one axle............the price is too good to be true so i was just wondering the pro"s and cons of the style of brakes on this new trailer.......the only doubt i have right now is it was used in saltwater a couple of times.....bearings and races have all been replaced.......thanks for any responces