Exterior Kitchen

I have been looking at some new coaches trying to decide if I want to suffer through massive depreciation:D. In any event on my present coach, a 2010 Discovery, I have the exterior kitchen factory option, which we have come to love. It has an exterior refer/freezer, sink, built in grill, storage cabinet, and stainless cooktop. The sink is plumbed with hot/cold running water, and the drain is plumbed into the gray tank. We use it almost every night that we camp. I love to tailgate as well. I haven't seen anything that comes close in higher end coaches that we have been looking at. Is anyone familiar with an aftermarket supplier than can retrofit a decent exterior kitchen? I am not looking for a Prevost setup, but something that could be done for under $5K. The option was $2K when I ordered the Disco, so I am not looking to go too crazy. The convenience of having everything all connected so that all I have to do is open the door and extend a tray with all the conveniences of a kitchen is too cool and easy that I want it again.