Learn how to inspect a MHP, run some cameras down the sewer lines, check for water leaks, other infrastructure, etc.

Obviously you might not be able to do that if your area doesn't have an option to recycle, just an example of unexpected things that may attract guests. we add much of what you typed, hooked up internet, seating on the balcony, tv, etc. also not sure if we should set up a ring doorbell security camera to see who goes in and out?

I guess the most practical aspect of it is to have a sewer camera inspection first to determine where the fault is.

I do the same thing when they check out, which I know they have done because I have outside cameras and a smart lock that monitors activity.

We have all of the measures in place that you listed, but these fraudulent guests know how to get around the vetting, agree to house rules, enter in the back door where there are no cameras, ect. 

I always have a sewer camera inspection done before I buy.

The tenant can change service plan but needs to use my router because I need to set up camera surveillance outside.

Those cameras were installed with notices to all tenants, there is a sign next to them and they are not hidden.

The inspector can use tools such as drones or cameras to capture detailed footage of the property, which you can review later.Hire a local property manager: If you're unable to visit the property yourself, you can hire a local property manager to take care of the day-to-day operations of the property on your behalf.Use technology: You can use software and tools such as video conferencing, online document signing, and cloud-based property management software to manage the property remotely.Partner with local investors: You can partner with local investors who can act as your eyes and ears on the ground.

I have security cameras in front of my property facing the door, mentioning that incase that has any use.