Fiberboard is probably not a very good choice. No matter how well you paint it, it will still absorb water and fall apart very quickly. Just pull the trailer down the road once in a gentle rain, and the fiberboard will begin to disentegrate.
A much better choice is corrugated plastic panels. They look like 1/4" thick cardboard, but are made out of a rugged plastic and will last for years. If I am not mistaken, it is even used by some RV manufacturers to enclose the underbellies of trailers for their four season packages. I've seen it in black and white, but don't know about other colors.
Now, where to get it? I know that sign shops use a lot of that material now. It has pretty much completely replaced cardboard as the material of choice for political yard signs and many more applications.
The manufacturers use screws into the trailer to hold the sheets in place.
I'd check with a sign shop first, and see if they can get if for you in 4'x8' sheets at a reasonable price.
Fiberglass insulation absorbs moisture, even when not exposed direct water sources. When it is wet, it loses all of its insulating properties and becomes a breeding ground for mold, mildew, and rust on your trailer frame. Since it will be enclosed, it won't dry out.
A better choice is the rigid blue foam insulating material available at your local home improvement center. It won't absorb moisture. It comes in varying thicknesses, and can be cut very easily with a small hand saw. It is usually sold in 8' lengths. If you bought a sheet of 1.5" thick material, you could easily double or triple thickness it in some places under your rig, and in others (like the bottom side of a holding tank), use a single thickness.
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