Hi Shiva, a 4x4 isn't essential as if you are following the more well trodden path as described in the EZ66 Guide you'll be absolutely fine with a standard saloon. Many people like using an RV but then you don't get the experience of staying in the iconic motels. However, if you plan on taking many photographs then RV parks are very often in scenic areas with lots of opportunities to shoot wildlife.
Lots to think about!
Set up the Driving Route 66 website in 2010 following the best road trip experience in 2007.
The best vehicle to me to travel on road is jeep. And the necessary tool for me to travel is 300w power inverter from bestek. In the travel, I need to charge camera, laptop and phone in the car. The tool is convenient to take away. The way for me to use it is to connect with car cigarette lighter charger outlet. Maybe you need to add this tool to your list what you need to travel on the mother road. If you want to check more details about this tool, you can search bestekmall on Google. Wish this point is useful to you.