Yup but still don't see the difference in risk although the value of the loss would be higher in one case than the other - but heck thats what we all pay the big bucks each year for insurance for isn't it?
You can loose your home or you could loose your trailer (your traveling home). Seems as I said pretty well the same safety risk level either way.
Interestingly enough most new homes in my area all have direct connection to the gas via an outside wall mount meaning the BQ in most cases is right beside the homes outside wall, many of them have built in BQ's located on an outside wall of the home. This is permitted under the building code and many/most of them are located on large wooden or vinyl decks with homes with wood siding.
The link you posted provided a conclusion as to cause of most BQ fires & injuries, which suggests the leading cause of trouble is lack of maintenance & not necessarily the location of the tank or the BQ:
Many outdoor grill fires could be prevented through periodic maintenance and routine product inspection. Also, homeowners should be made aware of the need for vigilance while cooking on a grill."