Stable income: Somewhat stable

Mobile windshield repair can provide a moderately stable monthly income for most people who try it. Based on online research and my own experience, many individuals consistently earn from this service, although there can be fluctuations due to seasonal factors or market demand. If your best friend quit their job to do this full-time, I would say it's a decent choice with some level of risk involved. I'd rate it a 3 out of 5 because while it offers a decent baseline income, occasional fluctuations may impact earnings.