"The tipper has been traced... The identity of the accused would be established soon," a police official said.
The victim was allegedly raped Monday night by the occupants of the tipper who offered her a lift back to Manali from Vashisth where she had gone to visit some friends.
The victim alleged that she was dumped later here in the wee hours of morning and the culprits also took away her valuables including an iPhone, camera, USD 30, Rs 5,000 and around 1,500 Thai Baht, said Kullu SP V K Dhawan.
Police said they were close to identifying the culprits, who are suspected to be in the age group of 18 to 25 years.