We put a Queen Sleep number (two sides) in our 2017 3721. I pulled the plywood off the front of the bed for full access. Installed an electrical outlet in that space. Mounted the air compressor there. drilled two holes for hoses to the air pillows of the sleep number.
REMEMBER to deflate any time you are going over any mountains. Over 500 foot and definitely over 1000 foot elevation change.
I hope this helps.
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