When I sold my RV's, both were from ads in the local paper. I created a website like you have and put the URL in the print ad. I also used all of the free classifieds like Craigslist. They generated calls but, as mentioned, the sales were from newspaper ads. I ran the last ad for 1 month with a photo.
Take a look the Roadtrek International Chapter website ad see if you can list it there:
Your price looks good to me. I'd put more photos up on your website.
You could always ask the question on the Roadtrek Yahoo Group http://autos.groups.yahoo.com/group/roadtrek/