So we just went on our first week long camping trip with the family to a new camping "resort" in the area. Loved it, the place was magnificent! We packed our travel trailer full of food and snacks...
Our approach is simple. We keep the pantry full, my wife makes and freezes meals for the road. If we eat out more then planed, we empty the frig and eat it when we get home. The pantry stays full for the next trip, except for stuff that will go stale.
It makes no different if the food stays in the pantry at home or the pantry in the TT till we need it.
When we winterize, we empty the pantry till the next season. No sense feeding the mice all winter.