I like using Craigslist, eBay, and Autotrader together when selling vehicles, but it requires being very smart with your replies to inquiries. Most are phishers with a quick reply "Do you still have (followed by your title)?" or other stupid replies like "I want it, still available?".
My ads include specific details on how to reply to me. Anyone truly interested will ask detailed questions and/or call you. Just delete all other replies.
People who bought a vehicle from me, say to me that they seen my cars on all 3 sites along with all my details, which made them comfortable contacting me. They too often connected with scam-sellers. The problem runs for both buyers and sellers.
I advise to place your motorhome on all 3 with lots of details and a means for legitimate contact. A phone call is rarely the initial contact. Most legit buyers will start with a text message or email to feel me out, then we talk on the phone.
It goes without saying to include many great pictures, inside and outside. Don't be sloppy. Spend the time because pictures sell. Step back and take outside shots from a distance zoomed in like I
DID HERE. I was 50 to 70 feet away taking many of those pictures.
Taking pictures close up gets you the distorted fisheye look seen here which makes the rig ugly.
Compared to this picture I took of my rig from a distance using my Samsung S7 phone.

Drive your rig to a large parking lot like at a mall for example. Stand 50 to 70 feet away and take your pictures from that distance all around the rig. If using a cell phone zooming in, keep in-mind of the loss of picture quality. You might have to stand a little closer then. Holding the camera up high or using a 6' step ladder can change angles nicely.
Contrary to popular belief, a cloudy day will provide "MUCH" better results than a sunny day. It greatly reduces the contrast between light and dark portions of the pictures and eliminates all shadows that do the pictures harm.