Sold my last RV thru them and it went well. They suggested a selling price based on the history that had on similar units and it was in line with what I'd found in other sales both private and commercial. The sales price we agreed to gave them a range they could negotiate within when selling, but if a buyer offered something outside that range they'd contact me giving me a chance to counter offer or accept the lower price. Took about two months to find the right buyer and then they did a complete inspection on the unit and found a water leak in my black tank. They gave me the opportunity of having them fix it or passing the problem on to the buyer negotiating an adjustment to the sales price. I had them fix it and they came in well under their estimate. Within 5 days of that I had a check in hand.
Overall if was a very good and fair process and I'd do it again if I wanted to sell my current RV. What I liked was not having to hassle with the financial issue worrying that the buyers check or financing wouldn't come thru. And in the end I got very close to what I'd have gotten in a private sale. Their commission was 10% on the sales price and I factored that into my asking price.