RVing in Japan made easy.
Here we made a pit-stop at one of the zillion convenience stores.
Hot fresh coffee, good quality pre-cooked food, general food supplies, place to drop off small amount of rubbish, clean toilets (courtesy: ask the staff if you can make use of the loo).
Even an overnight stay is "okay" but not recommended as trafffic is coming and going all hours.
There are plenty of places to camp.