AV,
brakes for a single axel are about $400 and take an afternoon to install and bleed. Hold out for disk brakes. I had drum at first and the salt water just ate them up. I recommend staying away from TieDown Engineering. I used them on both my brake kits. I am not satisfied with the quality at all. Fool me once, shame on you. Fool me twice . . . Plus, if the coupler needs work, you need a new coupler. You can't even buy a gasket for it. You have to buy the whole thing. Dico and Titan can be repaired reasonably. Other than that, it's pretty straight forward. A couple of wrenches and a socket set.
Don
.