What is the most number of rounds that the Team from RBR Enterprises and having a Chevrolet Silverado ran?
CREATE TABLE "part_time_teams" (
  "team" text,
  "truck_s" text,
  "driver_s" text,
  "primary_sponsor_s" text,
  "owner_s" text,
  "crew_chief" text,
  "rounds" real
);
SELECT MAX("rounds") FROM "part_time_teams" WHERE "truck_s"='chevrolet silverado' AND "team"='rbr enterprises';