Hunting cabin winter 2026: 4 people, 2 weeks. Service needed?

We have a hunting cabin in Montana with no plumbing, and we're planning a two-week trip in winter 2026. There will be four of us, all adults, no alcohol beyond a beer or two, and we'll be cooking simple meals. Temperatures drop below freezing, often into the teens. The ground is snowy but level, and a service truck can reach within 20 feet of the cabin. I'm considering a standard portable toilet for simplicity. Should I schedule a service visit during our stay, or will one delivery and pickup be enough? How does the cold affect the holding tank and deodorizer?