Both RedProw and BigJules are on the money with their advice on good photo's. Remember it always pays to listen to good advice.
My mate worked for a company that had a motto 'Perception is Reality' and I think there's truth in it.
IMHO several things are working against you. One is the market and two is the photo's that you have posted to represent your sale.
The first one is not within your control. The market is what it is. Having said that I believe there will be a buyer out there for you IF you present things well and entice them. Remember you only need one person keen to buy (so don't waste a shot until you see the whites of their eyes).
The second one is 100% within your control and easily fixed. Presently your camper (soon to be some else's camper) is not being shown at it's best. It's more like a cute chick with a black eye.
Let me share my story. I wanted to sell my Land Rover Defender and got offered a price. At first I thought 'okay it's worth what the market is prepared to pay and that must be it'. Then I came at it from another angle. I knew it was a good vehicle and would appeal to a like minded buyer. All I needed to do was let them see it as I saw it but through the magic of photo's and good presentation. Remember that the pics is all they will see. And first impressions really count.
So what I did was find the best locations I could and set up the Landy (sometimes with camper attached) along side rivers, tracks and other great locations that excite the mind of the buyer. I got a mate with a high quality digital camera and we went to work snapping pics & posting them on 3 websites.
Guess what? Before 2 of the websites even managed to post my advertisement the phone rang red hot & I had several buyers within a few days AND doubled the original offer. How's that?
Remember the key is presentation AND pricing.
Hope that help.
Cheers - Wayne
If you want any tips PM me.