Discovery 4: What to consider when buying/sampling?

Dear forum, we are about to buy our first Land Rover and will soon be adding a used Discovery 4 HSE SDV6 diesel from the MY16. We will therefore be looking at 2-3 cars at different dealers in the next few days. Do you have any tips for me what we should take care of during the test drive or when inspecting this model? Maybe we can better recognize certain LR or Discovery specific defects. I would be very grateful to you for every tip! Thank you!