Chaos in Cairo include rules for use of vehicles and mounted characters. But I´ve never tried out...
The basic rules are the same regardless fighting in carpathia or in egypt, the special traits are different. So simply use the rules from cairo.
btw: I remember DonVoss build a hearse for our last years CiC-campaign, but I´m not shure if it was more than just an eye-catcher on the table ?!