What is the difference between a crossover and an SUV built on a car frame?
I called the Acura dealer about the Acura RDX, and they said that the RDX is a crossover, and it is built on a car frame. I also called the Volvo dealer about the Volvo XC-90, and they said that it is built on a car frame, but it is an SUV (not a crossover). I always thought that an SUV is built on a truck frame, and any vehicle that resembles an SUV built on a car frame is a crossover.
How is it that the Volvo XC-90 is still classified as an SUV even though it is built on a car frame? What other criteria are there for a vehicle to be classified as a crossover besides being an SUV-resembling vehicle built on a car frame?