I looooooooove autoslash! I can't say this enough.
If you're needing to rent a car, you just type in the location and it lets you select the type of vehicle you need for cheaper than you'll find anywhere else.
Not ONLY this, but if a cheaper price occurs, it re-books the same vehicle for you and sends you a new confirmation through email.
If you don't trust me, just google reviews on it! It's amazing!