Have had this Avalanche for 4 years and it has proven itself to be reliable and a Joy to use. Have had 4X8 sheets in the back . The rear wall and window come down in seconds to fit larger objects Fuel mileage is excellent being a 4X4.340 k on it and it does not burn any oil. The 5.3 Vortec has all the power I need to pull my Auto Hauler and 30 ' Camper trailers. Handles great in traffic and any road surface or condition.