In March I'm landing on my first flight into LAX in about 10 years so the car hire info was definitely of interest to me - thanks to all who posted.
I eventually booked through Autoeurope as they offer no cancellation fees right up until 48 hours before booking - which meant I could make a booking at same time as I booked (reward) flight then I keep rechecking regularly to see if a new better rate comes up or if I fancy a different car then just choose to modify the booking (don't have to cancel and rebook to get new rates even if with another rental company).
Originally I was going to have a Mustang convertible but then a change in trip circumstances meant I needed something bigger so modified (easily, with difference refunded automatically) to a Dodge Grand Caravan.
This morning I checked prices again and there was an extra promo from Alamo since I last modified on Monday for the Dodge so I modified again to pick that and saved myself nearly £50 more (again difference refunded automatically)
I did try to use Skyscanner last year as they do include the 'local' car rental agencies at much cheaper prices but on that trip I found their basic prices brilliant but by the time I'd finished adding on the CDW, zero excess etcetera it wasn't much cheaper than one of the national/ international car rental agencies and I just felt happier knowing that as I drove around on 'tour' if I had an issue with the car I could go to another branch of the national/ international car rental agency and swap the car whereas with a more 'local' one I could have issues out of state etcetera