The RVI2 braking system is a fairly simple install, perhaps the simplest of the drop in braking units out there, here is a link to the install guide
http://www.hitchsource.com/docs/pdf/RVibrake2_Installation_and_User_Guide.pdf It consist of the display unit that goes in the motorhome, the brake unit which you place on the floor of the car you are towing, and a safety break away switch and wire which is run to the front bumper of the tow car. To install it in a new car is as simple as mounting the break away switch and running the wire to the drivers floor well area, where it plugs into the brake unit. Depending on the model of car you might also need to add an always on 12V outlet for the unit to plug into.
Base plates and tow bars are somewhat brand specific, though there are adapters that allow interchanging between the popular brands of base plates and tow bars, which bolt onto the tow bars in place of the standard end pieces. So you may want to check to see if your blue-ox tow bar has the standard blue ox connector mounted on it. If not you might want to consider whatever brand of connector you have when buying a base plate for your eventual towed car.
When it comes to shopping for a towed car I suggest checking out the dinghy towing guide
Downloadable Dinghy Towing Guides | MotorHome Magazine and make sure whatever you buy can be flat towed, this is not always that simple,as on some cars on certain transmissions, etc can be flat towed, it is not always as simple as automatic vs manual, for example with our Jeep Cherokee only the Active Drive II 4x4 automatic transmission version can be flat towed, the Active Drive I 4x4 can't be and neither can the 2 wheel drive versions.