I have landed a Dak at Sand Strips marked out by tyres in the Rub al Khali with absolutely no probs at all. We had to depart DHA very very very early so as to get there and depart before the heat built up though, so as to get off the strip with a decent payload. I would ask the previous operators of G-DAKK about the cost of European Charter and Pleasure Flights. They operated it for a while, and eventually, sadly, went bust, and it slid out of Bournemouth and landed at Popham, to escape the bailiffs. Popham is not by anystretch of the imagination, Heathrow. But it is grass and friendly.
It's arrival at Popham coincided with the Annual Garden Party of the Guild of Air Pilots and Air Navigators. Impressed the hell out of their Airships.!!