Sure the car is handy, and I probably would not take a trip without towing my Edge anymore. I also have a small dune buggy, Manx type, and it comes along on some trips if I wanted to do some off roading and meet up with people who have ATV's or motorcycles.
Yet with a small enough RV, you can decide to take the RV everywhere, and not have the expense and insurance of another vehicle. So if you are considering a Mercedes based small diesel class C, then you might not want to tow anything.
The 22- 26' long class C with a Ford chassis is nice in that the V10 allows plenty of power to tow a 3,500 - 5,000 pound car, you hardly know it's back there. It will cost you a tiny amount more in gas, like changing MPG from 8 to 8.8 while not towing.
Still if you plan on staying put for a while in a campsite, and doing a lot of sightseeing, then the car is nice to have with you. Are you planning on full timing? Then a car sure is handy, to avoid breaking camp each time you need groceries, or if you decide to take a job someplace like Yosemite or Yellowstone, and need to leave the RV in a campground for a few weeks. You can get a free campsite in exchange for agreeing to work minimum wage, and stay for most of the summer season. It is just a way for many retirees to extend their limited income, while also seeing a wonderful area, and working only a few hours a week in a gift shop or something.
The larger class C's such as 30' with a slide out might have to much curb weight to consider as a full time RV. Check the weight, and make sure that you can add about 1,000 - 1,400 pounds before reaching the GVWR. You are better off thinking of a smaller unit, it will allow more cargo before going over the GVWR.
Fred.
Money can't buy happiness but somehow it's more comfortable to cry in a
Porsche or Country Coach!
If there's a WILL, I want to be in it!
I havn't been everywhere, but it's on my list.
Kangen.com Alkaline waterEscapees.com