Try putting it on Facebook Marketplace. I listed my 2007 3075RL there and had a confirmed buyer in two days. And by the time I could finalize the sale and mark it sold I had over 20 more seemingly serious inquiries (and one flake.

) Now that was in May 2021 when the covid thing was going on and RVs were in demand. But it doesn’t cost anything and is worth a try. I listed it for the nada.com average retail price.
I limited the ad radius to something like 50 or 75 miles making it easy for potential buyers to look at the trailer. And made it easy to meet the buyer at a branch of her bank and her give me a bank issued check for the full amount taking any worry out of the payment. Our local town has multiple branches of every major bank there is.