How would one find “jobs that require lots of travel, but are based in California”?
Try applying to companies that are headquartered in California. Many big companies often require lots of travel, so as long as you apply to companies that are headquartered in California, you will likely find both criteria you are looking for. During your interview, make it clear that you are willing to travel as much as the company needs you to. Many businesses are looking for people who are willing to travel since most employees don’t want to travel much. Sources: It is my opinion.