Thanks for your replies
We've just started planning our trip, so I don't know much about Anza Borrego so far. Buying the book you mentioned, Mike, is a very good start, I guess. We just ordered it, not on DUSA but on a site here in the Netherlands (to avoid the shipping costs). It should be falling on our doormat within a few days.
We will be driving a rental car. So far, we have rented our cars from Alamo. Unfortunately, these rental cars aren't as good as we would like. One of the things we have planned is the trip to the Racetrack Playa in Death Valley NP, we would prefer to take two spare tires. We once asked Alamo if it was possible to take an extra spare tire, but they gave us no for an answer. We've never had an air compressor in one of our rentals.
During our last trip we had our first flat tire.... on the Smokey Mountain Road near Page, Arizona. So we know what it's like to be stranded in the middle of nowhere
Maybe there are companies where we can rent a car that suits us better? Tips are welcome.
During our trip (4 weeks, starting in LA en ending in SF) we will be staying in motels. Simple motels (motel 6, for instance) are fine with us. We never make reservations, so we can change our route in case of bad weather.
We're really looking forward to our next visit to the USA. With your help, it can't go wrong!!