That depends largely on where you’d like to go. Downtown Rockford, about 5 miles from Rockford, IL Airport (RFD-Greater Rockford), can be a little tricky to drive in. Make things easy for yourself by renting something compact, fuel-efficient, and simple to operate. Keep in mind that Rockford is a popular base to explore some of the prairies around Illinois. If your escape is more about steering down lengthy stretches of road, then you may prefer something with more trunk space and room to move. How about an SUV or a full-size car?