My guess is the truck is a 6400 series (154" wb), it will weigh between 8,000 and 10,000 pounds and be about 21' long (bumper to bumper) with a 12' grain body. If I'm right, your trailer will be to short to load it backwards, there's to much rear body overhang. Your tow vehicle can handle the tongue weight, so load it facing forward and let the bed overhang out the back.
Mike B
