I am trying to find an old thread that discussed under-bed water tanks for 1/4 ton trailers. There was a post of a CAD drawing for a custom made poly tank designed to fit between the frame crossmembers. I think the poster was from central or northern California. Unfortunately, I can't remember if the thread was here or on another forum, and I am not finding it by using the search function. Can anyone help me find it? I want to move my water tank from inside the tub to underneath, and the design was very slick. I'd like to use it. Thanks.