One endorsement that's proven effective is CG 20 10/CG 20 37 with the additional insured, primary, and noncontributory wording. At PuroClean, we implemented this to ensure that any contractors working on recovery projects were covered without disputes during claims. In one case, a contractor's accident during an active site recovery was fully covered because the clause was clearly defined. This wording eliminated potential coverage friction, ensuring smooth claims handling and protecting both our insured and the client.