Ok, you must mean the Gold State Coach, that is not very comfortable it must be said. Very much doubt if Trump would like it as sways alarmingly at times. It is pulled by eight horses and weighs over four tons.
I know tradition and all that... But come on, come up with something better. Maybe give up carriages all together and get a car. There is going to be another crowning soon, and lets do that with a nice car.