I agree, it's a water magnet. I am playing with mine right now- it's still too ugly and not working right to post a pic.
The way it was, the bottom of the bumper compartment fed into the bellypan under the Btank box, so all the water poured and collected at the bottom of the box. When I put in a new box and angle irons I put a longer belly sheet in that comes up about 3 inches in front of the black tank- so if you're looking in your bumper compartment you see the belly coming up in front of the Btank. The bottom of the bumper compartment is attached further back, behind where the belly comes up. This way most of the water is going out the belly. Right now I'm adding a 8" wide piece to completely block the black tank from the bumper compartment- except a whole for the sewer connections. I don't think it will be totally water tight, but maybe better than before.
I hope I'm making sense. Good luck!
"If you want something done right, do it yourself!"