Call around the Bend area for mobile RV service. Saving yourself some money. Check them on RVServicereviews
first. Using Google, I see several are there in Bend.
How far from town is your property? Are there other RV's, trailers, or manufactured homes on land in the area now? If so, talk to them, and/or the proprietors of local stores to find what kind of services are used by most people in your situation. People love to talk about how they've solved problems.
A small 3,000 watt genset, especially a new one, is a prime theft item. I'd just plan on carrying it home each visit.
Water in 2 of those 5 gallon jugs with plunger pumps works for weekend trips. You need around about 2 qts water per person per day for drinking. So a 5 gallon jug should last 10 days. Weekend trips only? Just cap the jug and leave it there. Add a cap of hydrogen peroxide (3%) to prevent slime and stuff.
Scientifically measured (not from ads by corporations) water usage by humans range: 1.4-8.1 qts/day for men and 1.3-4.9 qts/day for women. Hot weather and hard work increases usage from the minimums shown. Food is where you get much of your daily water intake, that is if you like vegis and fruits.
Since you are thinking of the blue cart, urine production averaged
2.3 qts/day in men and women.
As far as solid wastes go: On average, people produce 1 ounce of fecal matter for each 12 pounds of body weight per day, so it depends on your weight.
A 180 lb man will produce 15oz. per day. Plus the water needed for cleanliness.
Hope that's not too much FYI detail.