You would need just need regular RV/trailer insurance. We can quote you with several carriers at The Zebra by calling 888-807-3823.
Hello, Insurance regulations are very state-specific. Therefore, when you move to a different state, you have to get a new policy.
If your sister lives with you or uses your vehicle regularly, she can be added to your policy. Given her age and lack of driving experience, I would prepare for a big increase in your premium.
Car Insurance Costs
Insurance companies generally require that any person living in the household be listed on your policy regardless of driving status. If a member of your household won't be driving your vehicle then you can normally exclude them from coverage or have them listed as a non-driver.
Coverage & Claims
Unfortunately most insurance companies are taking a wait-and-see approach to ridesharing coverage so the answer isn't exactly clear. Each insurance company also differs in how they operate so your best bet would be to ask your existing insurance company about this specific question before you start driving for Uber.