As Jd suggests CW is a fairly good option. Dont know what their current specials are but when we got our rv the guy gave everything to tow as he bought it all new and had no further use! All roadmaster, I looked over the net found some fair prices for the base plates and then CW had a special on install, but as noted had to be bought from them. Well I would save about $150 off the net but found install shops got $75-100/hr to install. I paid the etra for the parts and got the install for $39 I think it was, yes I could do but I need my time for other stuff plus dont really enjoy crawling around under vehicles as much fun as it used to be.
I got the base plates, with install, the wiring harness with install and something else for around $700 and a day and a half later I had the car back. So check em out, sometimes low prices have hidden costs! Tow bars and brake setup can be found on CL and other places for about 1/2 of new costs and the tow bar really has no install that you cant do yourself if you can lift 25-30lbs. The wiring thing is sketchy, you can run a flat 4 to the rear and install but mine is all tied in, only thing they didn't add was charge wire, so make sure one is installed if you go this route.