Parkit360 doesn't recomend using the ball in a bulldog hitch (I called 1-855-996-9391)
Personally, my first experience using the Park it 360 7K with ball was not fun.
Remove the foot from the front jack and lower the leg into the socket. This is a much nicer experience.
to eliminate the need to block up the tongue while removing the foot I am going to purchase the over priced attachment that mounts a tube on the tongue.