Stepp Pre Mix heater for the heating and transport of asphalt material for pavement repairs.The Stepp patching line gives you the freedom of choice. From cold mix to hot mix Stepp has it all. The Stepp trailer mounted asphalt patchers are used for heating and hauling asphalt material for pothole repairs. Available in direct fired, electric and oil jacketed models. Available in 2, 3 & 4 ton capacities.