I highly doubt weight counts
I'm heavyset and my labor was pretty easy. Painful yes, but that's because I was induced and pitocin is a nasty biotch lol other than that everything was easy and smooth.
My sister is 300 (+/-) she only had a weak cervix other than that she deliver 2 daughters. The 3rd had to be csection. She was on bed rest at the end... Something to do with her pelvis. Can't really say if it was weight related since she was the same size with the other two.
Pretty sure it doesnt matter.
I don't think weight matters