Tom, make sure your insurance coverage is in force if you choose the "consignment" route, many policies wont cover the motorhome if you don't have direct control of it. Check e-bay, and other auction sites to see what they are worth. Selling it on this forum also works as severl members have done this.
Some folks use the RV Trader, and some folks use other RV for sale sites. You then can keep it where you have it and get e-mail notifications of who might want additional information.
One other thought is, to prep it for long term storage covered it up once you have it ready, and keep it for a while longer until the market improves. In this market you will take a killing on it trying to sell it now.
Recently there were several folks on here looking for the unit you have so you might get some questions just from this post.
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech