I did everything except the AC. It is not needed on the AC because it uses a FOAM seal and a through roof clamp to seal it to the roof.
I did seal the fridge vent and it went faster than my roof air vents (I had vent covers installed). There are 4 #2 square drive screws that hold the plastic vent cover on. They goop them in place but it comes out easily with an awl. Just remember to replace some caulk in the screw holes to prevent them rusting from water in the holes.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW