Response:
"A side fund could work. Just tell me when one of you is going to be disabled, and I'll let you know how much money you'll need to have set aside. Doesn't it make better business sense to fund the agreement in advance with fully tax-deductible business dollars?"

Objection:
"We'd prefer making installment payments from cash flow or surplus."

Response:
"Will you be able to guarantee that you'll be able to make those payments, no matter what kind of year you're having, or what kind of shape your surplus account is in?"