I made the box to cover the high pressure gas fittings and lines.  The inside of the box was sealed with mastic and on the bottom the bottom rim I used a closed cell foam tape to form the seal to the floor.  So now the high pressure side is on the outside of the MH which makes me much happier.
4 angle brackets hold it down and make for easy removal.
The remaining hole is for the fridge ventilation.
 
 
 
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