Planning a major backyard renovation at my property in the UK and thinking about installing artificial turf alongside a new gravel driveway. Since I frequently park and work on heavy classic cars, I need to ensure the sub-base can handle the weight without shifting the turf edges. While looking for vehicle dimensions and weight distributions in some old factory manuals from https://motorbooks.co.uk/, I realized drainage might be an issue. Any advice on the best heavy-duty backing for high-traffic areas?