Your post is a few weeks old but would your vendor of the new trailer be able to accommodate you with the listing? Obviously they will want a vig but you will stand a chance of selling it. Trying privately you only have the "obvious" places like CL or ebay and if the old Pennysaver has a digital version. The trouble with those are you are the only intermediary in the sale and the tire kickers will be crawling all over the trailer if it is desirable. Even the ones who have no money and no intent of owning can come by an have a look see.