Originally Posted by DennisDean2
Good idea to just use Dicor and not screws. I will try that. Thanks for the advice
The solution posted may work but I believe you should do some testing first. The flame is going away due to either vacuum or pressure. Since we don't know which then some experimenting is needed.
If the problem is pressure, placing "diverter" described by ScottBrownstein in front of the intake/exhaust would create a vacuum between it and the vent. If the flame stays on then you have found the problem. If it still goes out then move the diverter to different positions ranging from the 130 to 210 degree position behind the vent. That will create turbulence at the vent which would result in the vacuum be eliminated. I'm pretty sure one of those solutions should fix the problem.
Either way, you will be moving the diverter maybe several times so I'd recommend holding it in place with some Gorilla tape. Then, when you have definitely solved the problem make the solution permanent by using Dicor or something similar. Gorilla tape is serious stuff. I've never put tape on a trailer roof so someone else will have to advise if this is a good idea or it might damage the roof.