Consisting of a metal plate or bars, lava rocks, or ceramic or charcoal-like briquettes, the heating medium distributes heat and vaporizes juices, flavoring food. No particular material ensured more even heating or better-cooked food. Most grills have two independent burners or one burner with independent halves. Cast iron and stainless steel last longer than regular steel. More burners mean more flexibility.
Most carts have two wheels on one end and two casters on the other.
Wheels with a full axle are better than those bolted to the frame, which can bend after awhile. In addition to their stand-out performance in our tests, these were the only models among the 15 to feature a gauge showing how much fuel is left in the tank. With others, you must heft and guess.