Well, you'll get a zillion replies here, so I'll be first.
The most expensive part of this endeavor, other than the toad itself, will be installing the baseplate on the car so it can be towed. And the braking system. We have a ReadyBrute towbar which has a cable which simply pulls on the car's brake when you push on the coach's brake. It cost over $1k, as I remember, but it has served us well for four years. And doesn't require a "brake buddy" or other device to apply the car's brake.
We have a 2009 Honda Fit. After hooking up the tow bar, it requires no other prep than to start the engine, run through the gears from top to bottom, ending up in neutral, letting it idle for awhile, then shutting it down.
Do your research before committing. Don't get stuck with a cumbersome procedure that you have to do over and over and over. And yes, having a toad is a no-brainer. It allows you to take advantage of a park's weekly rate, yet be able to see the area, take day trips, run to the grocery store, etc. We wouldn't be full-timers without one. No way.
dave