We normally schedule a site with a convenience store for a one-mile walk from the pumps. We bring along antifreeze tablets and plasters. We decide on the number of gallons we need to fill your tank.
We bring along seeds for some edible plants.
We sometimes stay overnight even in undeveloped areas. We try to find a campfire location that will offer water, fresh air, and a place to gather wood to build a fire.
Most campgrounds are pick up and go. However, some have a year or more of parking and infrastructure. We try to look for the handicap facilities available.
No matter what your reason for a need, propane, charcoal, or otherwise, there is no good reason not to have your propane tank on your boat.