First, I can confirm 3M #4200 'fast cure' to be a nearly perfect choice for sealing the TM trim bits.
Are you speaking of the power vent above the stove, or the vent above the table (with lights)?
I would (and did) remove the vent trim on my own 2619, but I was doing an entire power-vent replacement for other reasons (less fan noise and more powerful airflow, mutli-speed and reversible). I feel that you have the right idea to remove it completely, because Atlanta humidity will otherwise promote mold growing on any surface with even the slightest bit of moisture.
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I can't advise a "best tarp" to use with your outdoor storage plan.
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TM='06 2619 w/5K axle, 15" Maxxis "E" tires. Plumbing protector. 630 watts solar. 450AH LiFePO4 batteries, 3500 watt inverter. CR-1110 E-F/S fridge (compressor).
TV = 2007 4runner sport, with a 36 volt "power boost".
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