A quick google search of your state indicates the following regaridng timeline to give notice:30 daysFor tenants who have lived in the property for less than one year, or have a lease for less than one year60 daysFor tenants who have lived in the property for more than one year but less than two years, or have a lease for more than one year but less than two years90 daysFor tenants who have lived in the property for more than two years, or have a lease for at least two yearsI'd definitely touch base with an eviction attorney in your state to ensure you are not missing any steps and to have the attorney as a backup option in case the tenant does not vacate easily.

I'm sure they're getting something out of it and I've asked tenants if they indicated they wanted to pay by credit card just to see where this is coming from.

A tenant complaining online might indicate that the property manager handled them appropriately, so be sure to ask the manager for their side of the story.7.

Assuming your property is in Utah (like your profile indicates), here's the state law from a basic internet search:In Utah, a tenant who abandons a rental property without notice is liable for the lesser of the following: The rent remaining on the leaseThe rent plus the difference between the fair rental value and the agreed-upon rentThe cost to restore the property to its original conditionThe landlord can also remove the tenant's belongings and sell them if the tenant doesn't claim them within a reasonable time.

So, their credit score may not be indicative of them as an applicant.

You're description indicates they DID NOT damage it as you describe the damage as "cracking" which is how door seals fail from normal use.

Past performance is no indication of future results.

In my experience, there are a range of starting-off experiences, but one's experience is not always indicative of someone's desire/drive/commitment to pursue and thrive in real estate. 

But 1) you're likely grandfathered in if they ever do, and 2) there are no talks or indications of changing directions on their stance. 3) long term rentals don't cashflow here, but our appreciation is super high.

They’ve also indicated they might move out.