From the video at the Good4Utah link in the first post, it sounds like family members drove down on Sunday, Jan. 14, after they hadn't heard from Jerry and Susan, who were scheduled to arrive in West Jordan on Jan. 11.
It's worth nothing that the missing couple was last heard from via text. It doesn't sound like that text raised any alarms (as it might if it didn't sound like Jerry and Susan), and that family members grew concerned after they didn't arrive in West Jordan. I wonder when the last time they were confirmed to be seen or spoken with on the phone?
The video also shows other houses in the semi-rural area and what looks to be a highway in the background. I noticed that front window of the house looks like it's boarded over (or maybe that's cardboard to shield from the AZ sun?), there's a home security sign in the same window, and the front door has a barred entryway. Jerry's FB page has a few photos with firearms.
Is the area prone to crime? Had they been robbed in the past (too common when people split time between residences)? I wouldn't think much about any of these factors individually, but when combined, they make me wonder if they either feared for their safety or felt they were being targeted for some reason?