RVT.com, RVTrader.com, iRV2 classifieds, Craigslist, Facebook Marketplace all have some advantages & disadvantages.
The keys IMO are...
Price it right! Takes research but will aid a quick sale
Clean & stage the rig for photos & be sure to edit and retake where necessary
Do a complete & informative write up
Having a complete maint record available worth mentioning but not necessary to include details in ad
Get the word out via above free / low cost sites.
You can build a website via any of the free services like wixsites.com or just do it in MS Word and copy paste into each of the above sites then add the photos.
Sent from my SM-T387V using iRV2 - RV Forum mobile app