Hi Gabz. The only thing I could find in Dover with the name "Hull" was this. It looks like an old photo of the house and the site where I found it has no information about the house being haunted. It probably isn't the one you are thinking of......
Dickinson Mansion has it’s own stories in regard to haunting.
I actually think I am going to have some time tomorrow (actually today) to do some digging in my own files for stuff.
But right now - I’m calling it a night!!!!
Thanks everyone, although I hate its politics, I really do love Delaware.