RV Trip Wizard is the gold standard, but it costs money to use and I'm cheap. I use RVParky for trip planning to define where stops will be. Then I use Campendium and CampgroundReviews for finding places to stay.
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Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips