Hi Dan
The easiest way, on the figures you've given , is probably to use a car and trailer.
You just fit the width requirement, for a car trailer, the other measurements are all acceptable.
Max width of overhang 2.9m without having to notify the police in each area you need to cross.
Where are the pneumatics and framework? Is 300kg the real weight of a simulator or just the cockpit 12" to the foot model??
good luck and enjoyment , if you get it!
Rod