There is tremendous business opportunity in the Portable Toilets / Washroom business in India. There are many gatherings where large number of people gather like marriages, exhibitions held in makeshift arrangements. Here toilet facilities are very basic and unhygienic. Providing portable toilets that can be moved or on wheels can serve the purpose. These portable toilets are not the basic ones but would be up market type. With all the amenities that can be expected in a fixed toilet setup. It would have running water, single use paper towels, liquid soap etc.
These are also called temporary restrooms and this service is virtually non existent in India.
Company like Shramik Sanitation Systems (http://www.3sindia.com/) offer wide range of indoor and out door toilets. They offer wide range of portable toilets.