Blue Ox is great equipment, but there are several brand names that will do just as well at much cheaper prices.
Watch E-Bay for what you need.
For example:
http://www.ebay.com/itm/Roadmaster-Falcon-6-000-Lb-All-Terrain-RV-Tow-Bar-W-Accessories-/322551664440?epid=1939724576&hash=item4b1993cf38:g:lLQAAOSw3YJZPiUI&vxp=mtr
I run one of these as a brake system. really easy to plumb and use.
http://www.ebay.com/itm/Brakemaster-for-coaches-with-air-brakes/222556241665?_trksid=p2045573.c100033.m2042&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D41375%26meid%3Dc4bd5556e172498da12ce68387021268%26pid%3D100033%26rk%3D2%26rkt%3D5%26sd%3D322551664440