The percentage of truly capable SUVs out of all of them would be pretty low. In fact someone here could make a list if they checked out all the reviews.

Anything that's tall and has 4WD can be called an SUV nowadays. How long exactly has the term SUV been in popular usage? Wikipedia says it was invented in 1960 by Toyota, but how long have most people been using it? Where things like the Ford Bronco and Jeep Wagoneer referred to as SUVs when they came out?