Vanagon Dometic 182B Diagnosticians, for your viewing pleasure...I present pictures of my Dometic 182b running from a BBQ LPG tank with the flame box opened.

Problem found & solved?

I gave the burner jet a very thorough cleaning: hydrochloric acid / sulfuric acid flush, followed by isopropanol. It seems to have made a big difference in flame height.

Notice particularly the side-view before & after shots -- i'd estimate that after cleaning, the flame size/volume/heat output is now at least double, if not triple what it was.

Notes:
Before Cleaning
High Flow (thermostat on max)
Low Flow (thermostat on zero)
Top angle, looking down
Closeup, showing the piezo electrode glowing red
Side View, High, Showing flame Height

After Cleaning
High Flow (thermostat on max)
Side View, High, Showing flame Height