Sounds like a partially (or completely) disconnected duct. Only way to find out is to either visually inspect it along its length, or use a boroscope type camera. You should not be experiencing that kind of temperature loss. If you are, then try to insulate the duct. Some rigs even have a slider type baffle where the duct leaves the heater. Check if it can be opened a bit for better air flow.
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1987 Starcraft Nova tent trailer, purch. '87, sold 8.14
2013 Crusader 290RLT bought new, 8.14 lotsa mods!
2001 Ford F-250 7.3
Loving wife, R.I.P., 6/6/19
and Mason the always dirty dog! R.I.P, 2/19
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