A assume that you've already considered this ( because you've been thinking about your vanlife for years now), but in case you haven't...
A lot of people choose to go the Planet Fitness route. Of course this depends entirely on where you plan to be living, as PFs aren't found in wildrness areas. Here's a thread on the subject -
https://vanlivingforum.com/showthread.php?tid=6224
Alternately, if you are planning on boondocking often, you can diy an outdoor shower in the space behind your door. Its space saving because it doesn't take up floorspace inside your van. You put it up and take it down when you need it. All you really need is a tarp, a clean garden sprayer, and a dowel. This works for a lot of folks. Here's a video of Bob showing how it's done.
Another thing to consider is that a shower, while convenient, is not strictly necessary for hygiene. A basin and a wash cloth works well for keeping your body clean. Depending on your hair, it might be easier to wash it separately outside where you can pour water over your upsidedown head. With a basin you eliminate many of the problemsthat come with a shower- better moisture control, less need for extra greywater storage, less freshwater storage and use, no need for an enclosure/waterproof curtain, no need for plumbing or a tray/platform/tub to stand on.
I know that doesn't strictly answer the OP question, but there are lots of options hygiene-wise that work for different people.
Peace,
Angie
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