Change to category/listing system

We have a website: [login to view URL] Built on WordPress We want to add a Locations page. This page will list the 50 United States and the Providences of Canada. We want to allow listings to be sorted by Location. But we also want to be able to sort by type of trailer. You'll have to figure out whether to use Categories, tags, whatever to make this happen. Needs to be done within 48 hours.