Main drain question

[mgreene]

I started looking at how to winterize our 2021 Springdale today and found I do not have main drain points under this trailer ( not that I can find anyway). I have a master drain for the fresh water tank but nothing else. I do have what appears to be 2 access panels on the bottom, but they don’t access anything! Just 2 16”x16” panels bolted to a solid panel. Any ideas?? Thanks