Keep the car.
In the fall of 2004, we started out with our HDT, two eight hundred pound motorcycles and our 5th wheel trailer. Later, bought a bright red Toyota Matrix and sold the motorcycles. The Matrix averages 35 mpg. It's not our chase car, it's our lead car. The wife leads and I follow. Works better for us since she is the navigator. We keep in touch with FRS radios. Have owned the car almost 8 years and have over 100,000 miles on it.
As for parking everything on a site. Haven't had any problems. Maybe once a year we have to park the truck someplace else in the campground. But when the wife calls for a reservation she tells them what we have and if they have a site that will fit us.