WRG, if you can secure a van or any car you can sleep in you'll be fine. I did 5 weeks in a wagon there a few years back. It's cold at night, but you'll have onsens every day. If you get a little stove and pot you can cook and save yourself the cost of that gear in 2 meals.
Lodging is the crux, so be sure you can sleep in whatever car you end up with. Ski area lots or roadside rest stops area fair game for sleeping, and some of them even have 24h bathrooms.
ride bikes, climb, ski, travel, cook, work to fund former, repeat.
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