Craiglist Auto Search

Software must search? craigslist? nationwide for automobiles Year, make, and mileage. ? I would like to search for vehicles that fall between a determined mileage. For example, if I search for a specified vehicle between 50,000 miles and 80,000. Software may utilize? Google? if this helps.? Both? Craigslist? makes it difficult to do a search like this from a single IP so it may be? necessary? to implement these searches through a list of proxies. ? If this is true, then proxy support must be implemented into the software.