Lest anyone think I didn't do my research... I have the original blue prints to our house, and the truss sheet. The house is a 1975-built ranch style 46'x26' with the trusses spanning the 26' width. Here are the reasons I did not believe the wall should be load bearing, as well as some pictures to go with that.
1. Truss sheet not super clear but says span up to 40'. Also I have read numerous times that trusses are almost always built with bearing points on the outsides.
2. Beam in basement falls directly below the middle of the hallway upstairs with no walls sitting directly above it.
3. There is an opening from hallway with no header or anything and is 38" wide so a truss would have to fall somewhere within that opening, unsupported.
4. Opening in 60" dining room doorway does not seem to have a header (using stud finder) but rather short pieces of vertical 2x4 to build "header".
These are the reasons I did not believe the wall would be load bearing. I also did not want to cut unnecessary holes. There is a double top plate on this wall as well. The house is built strong (2 layers of 3/4" subfloor for example) so it wouldn't surprise me if this wall was just overbuilt and not load bearing.
Photos...