Well, without prior knowledge about 'Big Ed and Rose', it's really a mystery. They could be individuals from a small town where they had some sort of adventure together, like perhaps they explored an old abandoned house and found a hidden treasure. Or maybe they were two people who fell in love against all odds in a community that didn't approve of their relationship at first.
Since I don't know the specific 'Big Ed and Rose', I can only make some general assumptions. They might have been friends who started a business together. Big Ed could have been the more adventurous one, always coming up with new ideas, while Rose was the practical one, making sure the finances and details were in order. Their story could be one of success through their complementary personalities, or it could also be a story of failure if things didn't work out between them.