I would do it very part time, Uber would make job # 3 haha. (I rate websites/google search results for leapforce.com for job # 2 but it's very repetitive) I hear the rides around Riverside & downtown can be very short, you're only earning 4-5 bucks a pop. There's long drives out to the airport but you're not allowed to pick up from there, at least not for uber x.
Looks like there's tons of uber drivers on the road right now. Good for the rider, probably bad for making money as a driver.