I cut out two 4x4 inch squares of 1/8" plate steel, I then took a holesaw and cut 1.25" holes in the squares for ventilation. I welded a heavy hinge to each square plate end cap. I welded the hinge to the bumper lining up the squares with the bumper ends. I then welded a tab inside the bumber. I cut a slot in the end cap door to mate up with the tab. I then keep them closed with a hitch pin. In the left side of the bumper I welded in a stop so the poop tube can't migrate to the other side of the bumper. The right side I didn't use a hitch pin, I used a cotter pin and bent it up tight. No reason to open that one really.
It turned out awesome and as strange as it sounds I get lots of compliments. Sorry I didn't take any pictures at this time.
1999 Ford Superduty F250 PSD CC SB 6spd 4x4.
B&W goosneck/companion hitch, Airlift 5000 airbags.
2006 Sierra F28 Rear Kitchen 5th Wheel, 31' = 10k pounds.
Nights camped in 09-14, 2010-23