I have a DEQ. The 150 3/8" topper was for the vanity side slide out and the 197" topper was for the living room slide. Both of my living room slides are the same size. The 197"topper has never been on the motorhome and the 150 3/8 topper was installed and removed two days latter. My cost was $485.00. You pay the freight and they are yours for $250.00!