Adding annexe walls to your truck or engine can provide you with much-needed weather protection or offer more space for large families when travelling. Since there are many very similar options, choosing the right add-on for the first time can be very difficult. Getting Started First, you need to know the size of your awning. Caravan annexe walls are purchased based on the size of the canopy rather than the truck’s size. It is best to start measuring the awning. The awning is measured from the centre of the vertical support arm to the centre of the vertical support arm. This will give you the total length of the canopy. Now that you have it buy a new one! Following is the guide for buying your next caravan annexe walls with some general information about them. Make sure to read this before you make the purchase. Wall type No matter which variant you choose, the wall must be customised to fit your truck. Vinyl is popular, but they produce a lot of condensation and retain heat. Canv