If you are wanting a more rugged trailer tent then the Holkamper Spedition, the larger wheeled Astro or the "3 dogs company" offer something far cheaper.
Admittedly they do no offer flat screen televisions or pressurised dust control!
Most of the facilities are able to be used from the outside like the kitchen, bathroom, fridge, utensils, bar, and other storage. But if the weather is bad, most of these features can be accessed from the inside as well.
Although I agree, maybe not ideal for the UK, but a great fun bit of kit
This is built for the Aussie market so no suitability for use in the UK except as a(very expensive)novelty. While we can certainly admire equipment that is used in other parts of the world we need to buy camping/caravanning equipment that is suitable for use in the places where we actually go.