When we did our thru-hike, we met a few people who were doing something like that, but it changed their experience from a wilderness camping adventure into a collection of day-hikes. And someone has to be the designated driver/non-hiker. And there are stretches in Maine where it is more than a day's hike between road-crossings.
Yes the trail is for hiking on foot. Motor homes are for hotel averse.
You can support a hiker that way, but some parts of the trail may be a ways away from you.
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