You probably should contact the embassies in Beijing first Uzbekistan embassy in Beijing for more information if you haven't already done so.

Uzbekistan Embassy in Beijing

2-1-92, Tayuan Diplomatic Compound, 100600 Telephone: 6532-6854

Turkmenistan Embassy in Beijing:

1-15-2,Ta Yuan Diplomatic Compound Telephone: 6532-6975

Iran Embassy in Beijing:

13 Dongliu Jie, Sanlitun, 100600

Telephone: 6532-2149

Also the Chinese embassy in Turkmenistan:

Ambassador: Lu Guicheng

Address: Hotel "KUWWAT", Road Archabil, Ashgabat, Turkmenistan 744036

Country & Region Code: 00993-12

Consular Office Telephone: 488131

Fax: 481813

Mobile Phone: 00993-66-308526 (24 hours)

E-mail: chemb@online.tm

Chinese Embassy in Uzbekistan:

Website: http://www.chinaembassy.uz/chn/

E-mail: chinaemb@bcc.com.uz

Chinese Embassy in Iran:

Website: http://www.chinaembassy.ir

E-mail: chinaemb_ir@mfa.gov.cn

According to the AIT site aitgva.ch/AIT_Site/…CPD_countries.htm

you do not need Carnet de Passage en Douane for Uzbekistan and Turkmenistan, but you do need it for Iran.

Have a good trip

sr82 silicon valley usa

You have to mention it when you get a visa. You have to pay 20 cent per mile while you drive. You can as more info to

ayan-eco@online.tm

They solved all my problems very easily when I drove last year. I bought small tour from them.