Found your post stating that you had some tin types of John and Emily Udell. Would it be possible to get emailed copies from you?
By the way have you read "Disaster on the Colorado; Beale's Wagon Road and the First Emigrant Party" by Charles W. Baley, Utah State University Press, Logan, UT (ISBN 0-87421-437-8)
I just finished the book which provides an excellant account of the disasterous trip and draws on many, many journals, diaries, newspaper, government and other reports about the wagon train of 1859. It really puts flesh on the bones of John Udell's account of the trip.