Today, I was looking for cars to rent in the states. Therefore I had to use several search engines of different companies.
A better way would be to use a matrix search engine like the ones used for booking flights. I would like to enter a pickup and drop off date and location and then the search engine should query a lot of different companies and list me the price for each alternative. I would also like to see a possibility to select nearby-pickups. For example big cities have several drop off locations, e.g. the airport, the main station, etc. At the moment I have to check every combination.
That's why my question is if there is something like a matrix car rental search engine as we know it from flights.