Enter your search criteria ( dates, times, location) and click on SEARCH.
At the top of STEP2 (above the individual car photos) is a scrolling left to right car type filter, where you can filter the results by car size, for example 7,8 or 9 seaters or convertibles where they are available. A credit card is required.
If no car photos are displayed when you try 4 months, then adjust your drop off date to 3 months. When it does show cars then that is the maximum period to rent a car.
If possible use a laptop,tablet or PC rather than a mobile to conduct your search.
I am here to help you to use the site if you have any questions.