I have a new 24ft Haulmark enclosed trailer. When hitched up the front of the trailer is significantly lower than the rear of the trailer. The truck I use (an 03 2500HD Silverado) barely even feels any toungue weight from the trailer. I assume this is not good for the trailer or my truck. I guess the guy sold me the wrong bar that the ball hooks up to. I guess it has too much of a drop on it. But I'm just guessing. Anyone know? BTW: the safety chains are almost touching the ground, and the trailer IS loaded correctly, it does this even when unloaded. Also I only have one vent. It is a roof vent. Can I drive at 55-65 with that thing wide open? Seems like it would put a great deal of stress on the vent components. Thanks guys.