Unfortunately, there is some confusion regarding the song "Katie Mae" and its origins. The lyrics you provided do not match any known versions of the song. It is possible that these lyrics are a variation or a different song altogether. However, it is worth noting that the Grateful Dead did perform a song called "Katie Mae" during their early years, but it was not an original composition. "Katie Mae" is a traditional blues song that has been performed by various artists over the years. The Grateful Dead's version was likely influenced by the blues tradition. The song's story is centered around a woman named Katie Mae. The lyrics suggest that she is known to be a good girl who does not engage in promiscuous behavior. The singer mentions making a mistake, possibly suggesting that he misjudged Katie Mae's character or reputation. The comparisons to a Cadillac and a T-model Ford are metaphors that highlight Katie Mae's physical attributes. Some people see her as elegant and high-class, like a Cadillac, while others see her as simple and basic, like a T-model Ford. The line about her not being able to carry a heavy load could be interpreted as a reference to her not being able to handle difficult or challenging situations. The lyrics also mention Katie Mae's privileged background, with her father having oil wells in his backyard. This implies that she comes from a wealthy or well-off family. The line about her not having to work too hard suggests that she may have a comfortable and easy life due to her family's wealth. The song concludes with the singer bidding farewell to Katie Mae, expressing that these are his final words. He mentions the possibility of meeting her the next day or the following one. The meaning behind these lyrics may be open to interpretation, as the song does not provide explicit details or a clear narrative. In any case, it is important to note that these interpretations are based on the lyrics provided. If the lyrics you shared differ significantly from the original song's version or if there are other variations of "Katie Mae," the meaning and story may vary.