What chassis is on the car repped by team rahal letterman lanigan racing?
CREATE TABLE "active_part_time_indy_car_series_teams" (
  "team" text,
  "num" real,
  "primary_sponsor" text,
  "driver_s" text,
  "listed_owner_s" text,
  "engine" text,
  "chassis" text
);
SELECT "chassis" FROM "active_part_time_indy_car_series_teams" WHERE "team"='Rahal Letterman Lanigan Racing';