You will need the following measurements for your order:
  1. Awning Rail to Ground
  2. Canopy to Top of Door
  3. Lead Bar to Ground
  4. Bottom of Door to Ground
  5. Wheel Well Diameter

NOTE: Add-A-Rooms are 1½ feet shorter than the stated awning size. To order a full-sized room for an 18 foot awning, for example, you would order an 18 foot Add-A-Room, which actually measures 16½ feet. This allows the awning canopy to overhang the room at each end. You can, of course, select a room that is any size shorter than your awning.