You might want to double check with the manufacturer, whether the novelty transportation (trailer) fabric is strong enough/thick enough to be used as UPHOLSTERY fabric. They do have a special sub-listing for Upholstery fabrics. I'd hate to see you make cushion covers out of thin old 100% COTTON, rather than nice heavy quality upholstery material that would stand up to the wear and tear it will undoubetly get.
Curtains would be GREAT, wouldn't they?!!!