Buy the Base Game plus the Southwest Bundle (California, Nevada, Arizona—wait, those are free), then add Texas (by far the biggest map). For roughly $20 during a sale, you get 50% of the total drivable roads. You don't need "all" the DLC to have fun.
By using Steam Convoy guest access and waiting for Free Weekends , you can experience the content for limited periods. All Ats Dlc Free
: Older map areas are periodically updated with modern graphics and more accurate road layouts for free. Buy the Base Game plus the Southwest Bundle