just my 2cts worth - have used the gas grille on the trailer side several times, and the supplied support bracket puts the grille about 8 inches or so from the trailer side, with no adverse effects so far. The trailer side doesn't get the least bit warm from the grille. There is a heat diffuser in the grille that directs the heat to what you are cooking, and away from the sides. And unless the metal sleeved hose is damaged, there is virtually no possibility of a leak - you can't connect or disconnect unless the valve is turned off. If you are careful, and follow the instructions, I see no problem here.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.