By boards do you mean the plastic underbelly covers held on with a bazillion screws?
I have heard the other benefit to the coverings is that it helps with air movement under the trailer while underway besides helping with weather insulation. Apparently without the coverings there is a tendency for the underside to get debris and dirt under everything. And it's also to seal out bugs and rodents when most of it is covered.
Maybe there's a way to hinge the underbelly coverings (make sure the hinges are on toward the front of the rig and the fasteners face to the rear. Aerodynamically that just sounds better). Sounds like a lot of work especially with problematic tanks.
Sounds like the best solution is to fix the tanks once and for all. Or leave off the covers until you get rid of the unit.
Happy camping,
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