For your 75 x 28 inch Coachman Chaparral windows, the best RV to provide insulation and privacy are custom-sized pleated or roller shades. We recommend the Irvine Custom Shades Pleated Day/Night model, which offers dual layers for light filtering during the day and opaque privacy at night, helping keep your camper cool and private. Alternatively, the Pleated Night shade provides moderate insulation and nighttime privacy, while the Valu-Line Night Roller Shade offers a sleek, easy-to-use option with good insulation and privacy. Currently, these shades are available in standard colors such as black and white, and there are no options with silver backing. The black or white colors will not significantly trap heat due to the shade's insulating properties. All options can be custom-sized to fit your window dimensions and provide a practical, easy-to-store solution compared to silver insulation panels.