Dually ExtendThe Dually Extend expands the sleeping area of the Dually by maximizing extra space with HESTs enhanced memory foam. The Extend easily attaches to HEST Dually modelsDually Extend 72 for the Dually Wide and Dually Extend 78 for the Dually Long or Queenoffering a larger mattress area suitable for slide outs in campers, larger RTTs, and RVs. It can also be used alone on benches or other narrower spaces. SIZING GUIDE "I've slept on at least 30 different