Perhaps he stopped to wash his truck in the missing time period.
If you go back and look at the picture of the truck behind the dental office it does look pretty clean. It also looks like there are puddles in the back alley so if roads were wet, you'd expect the truck to be quite dirty, especially if driving on dirt/gravel roads to the farm.
We moved from the Westbrook area of Calgary to Airdrie on June 29th, 2014 and I remember a lot of rain around that time. We didn't have landscaping done yet and there was mud everywhere when we moved.