The list will vary slightly, depending on the vehicle you want to tow.
Here's how my previous motorhome and Jeep were setup:
TOAD
Our current Jeep has an aftermarket front bumper, with welded D-Ring mounts. This is where I attach the towbar. Didn't need the baseplate kit.
All the other parts on the website were used for my current setup. Note that the prices have increased since 2005!
The only thing different that I added was a Roadmaster 9400 Even Brake system. It's a box that sits on the driver side floorboard, and has a pneumatic piston that connects to the Jeep's brake pedal. A receiver connects to the box in the Jeep. The transmitter goes in the motorhome. When the motorhome brakes hard enough, a signal is transmitted to the receiver in the Jeep, and the pneumatic piston pushes the brake pedal. Slick setup, but expensive. New, this sells for $1400. I paid $450 for a used one on eBay, and had to spend $100 to replace the broken brake pedal clamp, and the missing break away switch. Works great now.
Roadmaster and Blue Ox are two of the major companies with the necessary hardware. Both make excellent equipment.