Hi Badger Flyboy, and welcome to the forum.
I think you could go either way on selling the Ford, but there are factors you didn't mention in your post that might tilt the balance.
How long will you be gone? Obviously, the longer you'll be gone, the better the case for selling.
How long have you owned the Ford, and how much did you pay for it? If you bought it new, and the reliability has been near perfect, I think that would be one reason to keep it.
On the other hand, if it were recently purchased, and you've had trouble with it, that's good reason to sell.
Last, and possibly most important, is how badly would your wife need a spare vehicle if the Honda were to break down? If there are friends, relatives, or coworkers nearby that would provide transportation, that would be another reason to sell.
If not, maybe you could keep the Ford as a back up and cancel the insurance. If the Honda needed a repair that wasn't same day, your wife could call your insurance agent and reactivate the policy on the Ford.
Also, if you keep the Ford, make sure she starts the motor at least twice a month and lets it idle for 20 to 30 minutes. Exercise the brakes and transmission by putting it in drive and reverse, and roll back and forth a few inches a few times. Just a few times, no need to do it continuous the whole 30 minutes. Be sure to apply the brakes during the back and forth.