G – Model

Hello, I am interested in the current G-model (G463) with a long wheelbase. Does anyone know if there is a website of the G-model, as there are for E-classes etc.? And can the G-drivers tell me their experiences with their vehicles? What are they like? Which engine is recommended? What are the weak points when buying? When are the Mopf? Questions about questions… Thank you & Gruss E500 AMG