Report 62926: Sighting at dawn by motorist NE of Avinger near Black Cypress Creek

I drive the same route every evening to work a night shift at a hospital in Atlanta Tx.  I drive from near Avinger Tx to Atlanta down Hwy 155.   I was running late and got behind a guy towing a boat and he was going well below the speed limit so I took the first opportunity to pass him. He sped up causing me to have to speed up to pass and as soon as I got around him a state trooper came over the hill and I was flying, about 85 mph.  I knew I was in the wrong but the hwy takes a right turn and there is a county road to the left (cr 1579).  I turned there really quickly before the trooper was able to see me and he flew past the turn off and missed me. I did not really know where I was after I turned right on CR 1580 and it dead ends at Black Cypress Creek.  I turned around and started back the way I had come and glanced in the rearview mirror and that is when I saw it cross the road about 75 yards behind me.  I have a dash camera on the front but not on the back.  I tried to swing it around to get it on film but the footage was terrible. I know what I saw.  It was at least 7 ft tall and black as a hog but had to weigh over 400 lbs.  It was a freak encounter but I know what I saw.  I never believed any of this but there is no doubt at all.  It was looking at my jeep as it crossed behind me and then it was just gone.  I have not been back there and I am not sure if I will go back.