I've used spray foam in other applications, but I think that it would be difficult to use in the large openings of the front and rear cap. I've filled every hole up and down, and around every opening/crack,seam in the bottom covering of the trailer. If you attempted to apply it from the running lights, it would probably stick to the sides before it fell to the bottom, and leave the bottom open. Perhaps drilling holes from the closet side would work, but again, it would be difficult to control. So, I see 3 choices: go in from the closet and glue in styrofoam, attempt to spray in expansion foam from the closet or the running lights, or blow in insulation from the running lights. To me, the decision was a simple one.
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2017 36RSSB3--2012 F350 KR, LWB, SRW, bilsteins, 1 1/4" anti sway bar, bilstein steering stabilizer, airlift air bags, on board wireless compressor, 295/20 tires at 4080 pounds each, oversized finned aluminum diff and trannie pans, all synthetic fluids; KEM, Tyrant, and PIP tunes with SCT X4 programming, G37 2017 Turbo, ATS Stage I towing transmission and torque convertor, Edge CTS gauge monitoring.
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