That sure is the truth isn't it gfish.
I always start with the manufacturers warnings and would suggest that as the first point for any decision.
But we also know that in the sue happy culture we have, manufacturers have to take the route over precaution for their products. There are warnings on plastic bags to not put over the head and warnings to not get shampoo in our eyes...etc etc etc. ad nauseum.
Then on the other hand there are stacks of videos regarding vandwelling and a few "wink wink" statements about how to safely use a 1lb propane cooker inside the van.. or which mr buddy system to use INSIDE a vehicle.
Indeed I wonder how many buildouts are within building/manufacturing rv codes?
There is no doubt that code compliance will be how the govts. will crackdown even harder on nomads.
I have a feeling very few people are following manufacturer instructions in much of their van builds.
As I mentioned to the OP, I am a user of this product. I do have it installed with about 2+/- inch of clearance on the sides. I have tested the surface temperature after it had been running on maximum setting for over an hour. And yes I did read the owners manual, including the fine print.
I have no problems with heat radiating in the mounting I have and it is unlikely that the OP will either. I have complete confidence that I wont suddenly combust while baking an apple pie and a roast.
Prudent and sensible precautions such as a heat test prior to installation, a smoke detector, a CO detector, a propane detector, proper connections should always be utilized.
BUT just because someone says that you cant do something doesnt mean you can't. This tends to be a generational difference more often than not... if you know what I mean Vern?
How many folks paid a licensed electrician to install their battery and solar?
I have it so I can remove it and bring out side as well. I cant imagine using it when its 100 degrees inside.