I decided to change locations because of barking dogs, generators running, and people moving in closer. Fortunately, a short local move is a whole lot less of an ordeal than true Travel Mode, so it was no big deal to prep.
The entire available area of the Imperial Dam LTVA is stupendous, so I went touring and settled on a sort of peninsula that is sparsely-populated. It tested 3 bars of 4G Verizon in the open, and once moved in, 2 bars inside the camper.
The only hitch so far is that at 8:15 AM or so this morning, both the data modem and my cellphone both suddenly dropped to zero signal. Going outside eventually brought up a normal data signal, but I still can’t make a cellphone call. We’ll see what time does to that story.