Pros & Cons of having a living revocable trust when both settlors pass and resulting tax consequences

1. The living trust will automatically be dissolved with the death of both settlors? 2. If the trust is managed by the trustees after the death of the settlors, trust assets need to be stated at the step up value? Also, trust will be subject to a much higher tax rate? 3. It is my understanding that living trust helps to escape estate taxation and probate. What is the best practice after settlors death? 4. If beneficiary is unable to properly manage the assets after settlors death, what is the best approach to protect his/her interest? 5. If these questions are outside your scope of free advice, please provide the type of professional that I should seek advice from? Any idea about consultation fees? Thank you