Hi there! My friend has recently given me his 1986 D150 with a 5.2 L V8 engine. He has taken good care of it. I am looking to tow a travel trailer long distance. The weight of the trailer (equipped with trailer brakes) and passengers and everything will likely be ~4500 LBS. There is no sticker I can find on the vehicle, and I've seen conflicting anecdotes and advice about what people have towed with this vehicle type before. So, is 4,500 LBS too heavy a load for this truck? If so, what would you recommend as a maximum safe towing weight? I am planning on installing a transmission cooler and electric brake controller.