Select the F-Series cab design, towing (conventional or goose neck), and drive system (4x2 or 4x4) you prefer. Read down the column to find the trailer weight that can be towed with engine/axle ratio combinations listed. GCWR column shows maximum allowable combined weight of vehicle, trailer and cargo (including passengers) for each engine/axle ratio combination. Maximum Loaded Trailer Weight assumes a towing vehicle with any mandatory options, no cargo, tongue load of 10% (conventional trailer) or king pin weight of 15% (5th-wheel trailer) and driver and passenger (150 lbs. each). Weight of additional options, passengers, cargo and hitch must be deducted from this weight.