To give you a data point - we sold our 2002 Georgetown 325 Class A in early December. They originally estimated an asking price of $28,500 and anticipated being able to get about $25000 for it. After 4 months of no activity whatever, they called and said they'd had a bid of $14,000!
I told them to stick it where the sun don't shine and their response was "come pick it up". DW didn't want it on the driveway again, so I negotiated and ended up getting $15,200 for it, after paying the consignment fee.
I think I got screwed, but don't have any recourse. The dealership refused to tell me the name and address of the buyer. In Washington, we have to file a "Seller's Report of Sale" and the dealership wouldn't give me the buyer's name and my only choice was to put the dealer on the Report as the buyer. I haven't been able, yet, to find out what they actually sold the vehicle for, but I will be talking to our State DOL's criminal investigator next week.
I would STRONGLY advise against trying to sell through a consignment dealer. Either sell directly to a dealer (and take your lumps) or sell privately.
I'm not going to identify the dealership on line, but if anyone in Western Washington would like to know, please send me a private message.