Towing questions-->Step bumper, trailer brakes

[j-dogg]

In a couple of weeks, I'll be towing a 4,000+ lbs. tractor from south Texas to Dallas with my 70 C-10. I don't have a receiver hitch, just the factory step bumper. Will it be able to handle the weight of the tractor plus the trailer, or do I need to invest in a receiver hitch?

Also, I don't have a trailer brake unit on my truck, but I do have disc brakes. I won't be encountering any giant hills on my trip, so will trailer brakes be necessary? I don't trust anything the guys say at my local trailer dealer.