To diversify your services you may want to try WeGo Look. I signed up with them in December and so far this has been a steady stream of income for me. You take pictures of vehicles for Insurance and Dealerships that pay $20-$40+ for each vehicle. It takes me 15min per vehicle on average. No special equipment is needed other than a tire thread gauge ($3) and a yardstick ($4).
I have been able to schedule inspections between my Notary assignments. In early Jan I received a 17 car inspection order from one dealership which I knocked out over the weekend and was paid the following Friday. I do on average $100- a week with them… easy money.