i buy and sell cars, im a dealer. Here is why you cant sell your truck. The psecific trim of you rtruck is not in demand at all. Tacomas are HOT in the market and they are known to hold up their value. If someone wants a Tacoma they are looking for v6, AT, DC, 4x4 and if possible a TRD package. Only a selct few settle for the access cab, MT and 4 banger. Sorry but this is the truth. Your truck is priced right for the value but you just have to be patient and hopefully you will get lucky. If you need the cash that bad, you will be better off just selling it to a dealer but dont expect anything above 18k for it from the dealer.
Mine was a rare find, in that it hadn't been on so much as a dirt road yet and nor ever was it in Cali to be launched off a dune. Your truck will sell, but you need to wait for the right buyer. Getting anxious to move it will likely end up costing you more in the long run. As others have said, losing the "kid style" modded up ad will help a great deal. I too would have ran your ad over and not bothered to back up based on its original wording. Dropping over 20 large on a used truck puts you in a bad bracket, in so far as the cost and benefit of buying new isn't that much further away.
I would put it back to stock, as in make it smell stock... list it as such and it will sell faster than the previously marketed attempt. There are guys like me who have done the mod thang, and just simply prefer to run em as they make 'em.