I'm less concerned about quantity than quality....

The bank account may be temporarily frozen at the time of your death or by court order, especially if federal levies the estate tax and sufficient funds are paid for IRS taxes.

I want sufficient liability insurance to cover my assets.

Insufficient cash flow from other sources to cover emergencies and buy a sufficient number of properties. 

Any general quantity of mailers or criteria that has worked well for anyone?

Having an agent in Washington State isn’t sufficient; the law also requires that the trustee itself maintain an office with a phone where homeowners can go to resolve their foreclosure issues.The investigation is being conducted solely by the Washington Attorney General’s Office, which is also a participant in the multistate investigation by attorneys general into abuses in the mortgage servicing industry 

The issue will be if the income is not sufficient enough to repay the loan, or is considered variable and not consistent. 

Advertise the max it will sleep with 2 per bed and then be specific about the type and quantity of beds you have in each room.Then people can decide if it fits their needs.

However, If the beneficiary buys the property at the sale (in the event that there are no sufficient bidders), the borrower – mortgagor would have the right to redeem the property, getting it back by full performance of his obligation.

(He was 96 so he didn't really understand what telling the bank would do.The key is to have sufficient reserves or access to capital to be able to pay off the loan.