Dual spare wheel carriers for LandCruiser

Have just been through the process of getting prices for a duel spare wheel carrier for the 76 Cruiser. All around the $3000 mark and I can't justify spending that amount of money to carry one extra spare when only needed a couple of times a year. When I had the Navara duel cab D22 I designed a carrier that fitted into the tow hitch and carried the second spare sitting in the middle of the tail gate. When I needed to open up the back I simply removed a lynch pin, pulled out a locking pin and the wheel folded down and turned under the rear of the vehicle to lay flat on the ground. To replace, the wheel is lifted by means of a lifting arm and pivoted back into position and the locking pin replaced. The whole process takes around 5-10 seconds to perform and does not impede access to the rear of the vehicle. When a second spare is not needed the whole device is removed from the tow bar simply by removing the tow bar pin and as it is not a large item can be easily stored away. I am now in the process of making one up for the 76 Series but this one will sit directly behind the spare on the back door and I hope to have it almost completed today and hope this one works as well as the last. Should patent the design LOL as they are a much cheaper substitute.