We bought a Timberwolf 39DL a few weeks ago but it is still at the dealer because our site is still being prepped, so we don't have any useful paperwork to refer to. I just learned that "king bed" in RV speak can mean at least three different sizes. Does anyone know the dimensions of the standard "king bed" in the Timberwolf 39 DL? We are looking to order a mattress topper and want to get the size right the first time!