Trucker,
I fully recognisd that the shockers were an after fitment by you, however my point was that were they part of the van when you offered it in part exchange, and did you specify to the dealer that you were removing them. Again, I doubt the dealer will give a toss, as he will re-sell as seen. Don't forget he will have valued your van as a total item, not separating items such as built in microwaves etc. If that valuation was not to your liking, why accept it?
Of course, we all remove our ancillary items such as locks when trading in. I also removed my battery because it was an upgraded one supplied by the dealer, and paid for by me. He in turn replaced mine with the new smaller one from my new van, something I was happy to agree to.. I also left a spare wheel and tyre unused, that were supplied by me. They would not fit the new van so yes, I could have removed them and resold them, but life is too short, and no, I am not a millionaire. But it does sound from your Posts that you do not enjoy a happy relationship with the dealer, so why use them I wonder.
I have recognised that dealerships are commercial enterprises and need to make money to survive. I also accept that some are more belligerent than others in how they do this, so if I find one that is prepared to work with me, then I am prepared to follow suit. Maybe I am a old fashioned mug, but then again I give money to the Sally Army every week, and do not expect anything in return.
Good luck with your sale though.