Payload is not in addition to tow rating. I believe the GCWR is 8,145# if I remember correctly, he has a 4,000# AWD Truck, a 4,000# minimum trailer, plus 1,000# in passengers and 600# of cargo. Grand total about 9,600#, WAY over GCWR.I'd say that you're probably well over your 4000 pound towing limit, and pushing the 1500 payload as well. Keep it slow and local.
As for frontal area, yeah, probably over the 40 sq feet recommended, but that is not a hard limit imposed - it merely says that performance will be affected in a bad way when you're pushing that much wind.
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