I'm very sorry for your loss, and commend you for looking into the future to continue RVing.
Re your question....
When we were trying to sell our DP quite a few years ago, we contacted one of those companies. They offered us around 60% of NADA. It was a pretty bad lowball offer. We ended up selling to a private party from Canada for much, much more, on CL.
If you are not interested in selling private party, ( which can be a daunting task ) maybe consider a local consignment lot or PPL in Texas.
If you would consider a private party sale, try RV Trader, RVT, and CL.
Best of luck to you. Stay strong and keep motoring. If I lost my hubby, I would change to a small Class C also.
Cheryl