If the vehicles not removed, then they'll pick it up.If the vehicle is operational, properly registered, and belongs to you neighbor two doors down, the cops aren't going to play that game. 

Landlord insurance would cover the structure and any personal belongings you have in the home (not the tenant). 

What should I do if in  the property has belongings and furniture of the old owner?

I now have to give this tenant a 30 day notice of non-renewal.The unfortunate part is this tenant had to move out all their belongings by January 31st in Nebraska, which if you didn't know we get lots of snow at this time.

You'd be left with personal belongings of two individuals that are in jail and no rent income.

Estimated cost is ~$25/month for $500k coverage and covers THEIR personal belongings, plus my house in case of their negligence.Do you as an investor require this as well?

I am not sure yet if the fence belongs to the neighbor or to the current land owners, since the entire property is already fenced in.I am half-tempted to purchase the land, close the hole in the fence, and tell the neighbor to figure it out, since they knowingly put the meter on the property line without consulting the adjacent landowner, i.e. the seller of the land, but, saner minds have prevailed and I would rather not come into a property and start strong-arming the neighbors.  

You also need to pay the sentrilock system in your area in order to obtain access to the lockboxes used in your area.However, belonging to these organizations and being a "Realtor" is not required to maintain a license. 

Estimated cost is ~$25/month for $500k coverage and covers THEIR personal belongings, plus my house in case of their negligence.Do you as an investor require this as well?

I spoke to the county clerk and was told these belong to a person with my same name and it appears to be a mistake.