The Keystone Cougar 22MLS is a couples’ camper that features a king-sized bed, standard solar and a lot of the features that come with the Keystone brand. Today’s RV review looks at this model to see what unique features Keystone brings to one of my favorite floor plans. These honest RV reviews are written to help you gain insight onto the best and worst features of new RVs so you can make a better choice.