Where's That Bolt of Lightning When You Need It?

I'll be honest. Sometimes, doing family history work is not all joy and sunshine.  In fact, many times thunderheads of frustration rain down when people are not where they should be or connections and records that should be there don't just pop up.

My two current cloudbursts are:
1. Where and when did my great great grandparents get married?  George Smith and Elizabeth Altrop were born in England, immigrated to the United States and had children.  We hope that at some point they got married, but there does not seem to be an official record of the event (just their temple sealing in 1891).
  This is a picture of their headstone in Willard, Utah. Note that it says they were married in England in 1867. I can't find a record of this and Elizabeth is still using her maiden name on the ship's manifest in 1869.  Another source says that they were married in April 1867 in Willard; however, they didn't reach the US until 1869.  A note on one of the family group sheets passed along to me says that they were married on the ship coming to America. No one who kept a journal on that voyage made note of any marriage.  The 1900 census reports that they have been married for 30 years.

Can I get an umbrella here?

2.  Who are John Marsden and Hannah Maria Sunderland?

This is a note among other notes that I believe were prepared by my great grandfather Charles Smith.  All of the other notes pertain to family members.  But who are these two people?  I can't find any connection with the family, although these were certainly real people (I found them in the census).  On the new Familysearch Family Tree, these two are a little island without any children and no connection to anyone through their parents.  I feel sorry for them, all alone out there, but are they related to my family? 

I'm wishing for a raincoat!