we are planning on travelling to Central Asia next Spring and later to get to Southern Asia for the Winter. I have a few questions regarding planning/preparation:
1) are VW T4 Transporters common cars in Central Asia or not? Based on this I will take more or less spare parts with me. After some travels I am now somewhat capable in repairing our car

2) do I need to make any preparations due to high altitude? Ours is a turbodiesel which should cope with higher altitude better, already have it raised as our last trip was to Western Africa.
3) any other issues to take into account? I know about the scarcity of diesel in some places, is it also poor quality?
4) approximate plan is to stay in lower areas of the Stans April/May, higher areas in Summer, Autumn - Iran, Pakistan and into India. We like to travel slowly and get to know a place we visit quite well. Is this a reasonable schedule for slow travel?
5) what is the attitude towards dogs in the area? Ours are 2 bigger shepperd dogs that are used to travelling (we just came back from a half year in Africa) and heat so no problem with that. More if people will be affraid or on the other hand curious of them.
Thanks!
Matt