A boat is heavy and tall
and has a lot of windage. You will rarely, if ever, see a car on a trailer with only 1 axle. And any boat in the 22+ range is going to be the same or more mass, more windage, higher CG, etc etc. I have to assume that single axle, brakeless trailers are for the occasional slow-paced moving the boat on the highways, or just in and out of the water at a marina. Ever watch the trailer in your mirror? There is a lot of sideways sliding at highway speeds. If you ever hit a bump with just one tire, watch how much your boat oscillates side to side, and how long it does. It's scary! You need to keep your tires at ~ 40+ psi to be safe (think, 2500 lb car needs 25 psi x 4), and a 40 psi blowout is a lot more severe than a 25 psi blowout. Hurley - i'm collecting parts to do this myself next season once I launch my boat. $500-%600 for all new parts is as good as your going to get - only brake one axle and you can save a little, and it's a relatively easy ad-on later. $1100 is certainly not a bad price if they do quality work. Hoever, if you feel handy enough and are willing to take the time, you could buy all the tools and material to do it yourself (welder, etc) for about the same - but make sure it's pointed straight ahead!!!