Ray-Ban Sunglasses | Rayban RB3136 | Caravan £85 - Buy with confidence from Rayban Authorised Retailer. RB3136 is available in 7 different colours, and 2 sizes. The RB3136 Caravan is a classic style Ray Ban with a rectangular lens shape. The RB3136 is a metal frame with a double bridge. The RB3136 Caravan comes with a Ray Ban case and cloth.