You going to buy all NEW or will you also be in the market for used. Craigs list usually has a number of towing accessories for cheap. Includes the brake systems. BUT, they may not be for your particular vehicle. The tow bars and stuff will all be OK, but the base plates will need to be purchased new in all likelihood. I paid around $700 installed for my base plates from roadmaster. The falcon all terrain hitch with the cables etc came with the rv we bought. New for a hitch assy can run up to $1000 from what I have seen. Just look at a camp world catalog or go to etrailer, or trailer and marine I think it is and get some prices from them. They may be a little cheaper. I could have gotten my baseplate for about $150 less than I paid, but then you have to either install yourself or pay $75/hr up for someone to do for ya. I paid $39 for my install, also they installed the light kit. The brake system also came with the rv, they new run close to $8-900 or better depending on brand.
So you need to determine how you want to go. There are some rv junk yards that sell serviceable stuff, but generally limited to the tow hitch/bars.
As to the vibe is it a manual or auto? Check owners manual to see if it can be towed and if so how. On a trailer, 4 down etc.
have fun. We just went thru this in the last 18 months so I know what you are looking at.