I think whether or not to tow a car depends on what kind of camper you are. If you mainly go to your favorite CG and stay there, then return home, there is no point in towing a car. If you are a tourist that travels to see the sights, then a car is necessary IMHO. We normally stay 2-4 nights in one place and use our car to sight-see, then move on and repeat the procedure.
Its much easier to sight-see with a car and also using the car at 30 mpg beats the MH at 8-9 mpg.
Most of us do a mix of the 2 extremes so it depends on your mix.
We see about a 1 mpg hit when towing 4 down and it doesn't affect your driving much except you cannot backup with a toad.
You might want to try it without a toad and then decide what is right for you.
PS. One of out friends bought a dolly and now, after a year or so, says he wishes he had bought a towable car instead. YMMV.
