A Biography of Peter Olson Palmer in "History of Wabasha County" copyright 1920http://files.usgwarchives.net/mn/wabasha/bios/popalmer.txtThis bio describes “Peter O. Palmer” as a prosperous citizen of Lake Township. See the link. I’ll paraphase some of it here. I think I’m not allowed to copy it verbatim.
Born in Landskrona, Sweden, February 17, 1867, son of Olaf and Elna Pearson Olson. Enlisted in the Regular Army when he was age 17. Per military requirement was given a new name, Palmer, and stuck with it in the USA. Honorable discharge at age 21 [circa 1888].
He then emigrated to America. Future wife and partner Maria came to America on the same boat and at the same time as her husband.
Arrived port of New York and went directly to Wabasha County, Minnesota. He had a brother living there, Olaf Olson, who had arrived three years previously.
Married in early 1890. Wife Maria was born October 29, 1862. Her parents were Per and Anna Mary Shuberg Swensen of Sweden.
Peter worked a year in Lake Township. In the spring of 1890 went to Minneapolis. Returned to Lake Township in 1894. Etc.This history supports the idea that you may well have found the correct emigration information for Maria and Peter, despite the wierdness of the name Joh. Palm. The destination "Lake City, Minnesota" is remarkably specific and is highly suggestive of the idea that one or both have family or friends there. And apparently they did - Peter's brother.
There's a little contradiction of facts but that usually happens in biographies written much later.
===========================================Ole Olson, brother to Peter Olson Palmer, biography in the same book, above:http://www.rootsweb.ancestry.com/~mnwabbio/2o.htmThis biography alludes to difficulties in being released from military duty (Ole had to promise to return to Sweden). Perhaps Peter Olson Palmer had similiar difficulties that didn't make it into the history books...?