That's how I bought mine a year or two ago. Great deal. Besides adding factory Remote Start, I consider Crawl and MTS to be essential additions to this model. The GX is pretty amazing. Thanks @Acrad for starting this thread.
Can you post a picture? 'cause if there's no access panel in the skid, even if you remove the housing and filter from the side, the residual oil is just gonna create a huge mess on the top side of your skids. Seems you're stuck just pulling this...