The way I read the fia rules a T1 vehicle for cross-country could use an engine from a T2 homologated vehicle.
The Toyota Landcruiser VDJ 200 is a T2 vehicle with the 1VD-FTV engine.
I thought there was a 3 litre limit for T1 turbo diesel engines in the regulations.
It might be interesting to see how a 1vd-ftv twin turbo t1 hilux would run at high altitude for the Dakar.
http://youtu.be/Q8YSwxNQh9Q
http://youtu.be/X-WYjvI2iYQ
"Financial in every sense of the word, as explained by Glyn Hall, the Team Principal at Imperial Toyota, which last year finished second with Giniel De Villiers. "True, the rules as they stand now are more biased towards diesels than towards petrol engines, which have a lower inlet restriction, so if I had been given a choice I would have taken a diesel. However, the South African off-road championship is every bit as important to Toyota as the Dakar, as South Africa is the biggest market in the world for pick-ups. But diesels are not allowed in this championship…Our petrol engines are a handicap, which is why we decided to swap them for the best engines in the Toyota range, but we also put a huge amount of work into the chassis and the suspensions to compensate for this disadvantage.""
I think the Dakar is important enough to build Dakar specific vehicles, look at the YouTube viewer numbers for Dakar videos vs South African Off Road Championship videos. There are the FIA cross country rallies the ex-Dakar vehicles can go to afterwards or the rallies can be used to develop the vehicle for the Dakar rather than using the South African Off Road Championship.