We did as much of the Oregon Trail as we could get to about 20 years ago starting in Omaha and ending up at Astoria. My wife was a grade school teacher and wanted material. In those days most of the markers and interesting graves were on private property or way off the major roads. We had a TT at the time and it was difficult to get to some stuff. We have been through there several times since and were amazed at how much on private land is now open to visitors and new information added. There is a book "The Oregon Trail" by Rinker Buck published in 2015 you might want to read if you decide to make the trip. You may want to start in NE and visit the Exhibit that is built over the freeway dedicated to the Oregon Trail. Worth the effort.