Jackie, I stole the idea for the box from Ed Harris, and there are several posts (both his and mine) with pictures in the "Problem Solving -- Owners Helping Owners" forum, under the
title, "Exterior Storage Box Ideas." We both got them at Lowe's and used uni-struts (found in the
electrical department) to mount them. I put the struts in the bottom of the box and came up through the bottom with U-bolts under the frame. If you put your
propane tank in the box, be sure to put a vent in the bottom in case there is any
propane leak it will not accumulate. Here's one pic of the box, but there are a lot more on the site I mentioned above.
Bob