I have a friend that bought from RVWholesalers and had a fine experience. He drove to Ohio to pick it up and it was as described, no hidden fees or anything. He agreed to the price, with all taxes, PDI, etc included before he drove out there.
But this was his first camper and he had no trade in. They are wholesalers, so they are going to low ball the heck out of you on a trade in. Furthermore, they know that if you hauled your camper all the way to Ohio then are at their mercy. You can't tow BOTH trailers home, so they know that they hold the upper hand on a trade. You will have invested good money and time into towing your old rig out there and will invest MORE money and time into hauling it hack home, plus you won't get the shiny new trailer. All that equates to them holding all the negotiating power.
Based upon that, I think you are better off trying to negotiate a better price from your local dealer. Check your other thread, I highly recommend Keystone Mega RV which is a little over an hour from you. They have a wide selection of makes/models and really competitive pricing. Again, they are wholesalers too so they don't want your used camper and will probably give you a lower price than you want.
If you can afford it and have a place to store it over the winter, I would suggest you consider keeping your current trailer and offering it for sale locally in the spring. The market will get higher in February/March as people in the mid-Atlantic start thawing out and considering vacation options for the year. I sold my old trailer on Craigslist relatively quickly. It made it super easy to negotiate my new trailer without worrying about the "trade in balloon" effect.
Good luck!