Without knowing much about your RV, some things to look at. Locate the heater itself and get to the back side. There could be a jumble of flex ducting that could be pinched. As a nature of the beast, the closest ducting gets the most flow and it's less from there. Often the end of the line has a bare trickle. Blocking off one close to the heater may improve air flow to the end of the run. Air follows the path of the least resistance. If you can remove the ducting end, round or rectangular, look in with a flashlight and inspection mirror for an obstruction. Could be construction debris since they are not careful at the factories.
About this 2 vents by the door, if you will attach a picture that might help someone identify them. On some 5th wheels the stair riser going up to the front area has vents to the basement area. Those are a heater return of sorts and allow heated air to the under floor basement area where the holding tanks are. That can be the "heated tanks" referred in literature. Heated tanks also can be heat pads glued to the bottom of the tanks. Those would be a 12v switch controlled.
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