I've owned 2 campers, each of which came with the attachable grill. The first one mounted to a rail on the camper - rail came loose in the middle of cooking. New one has a bumper mounted swing-out grill so at least the grill won't fall off. These are non versatile single burner grills so you can't indirect cook.
I use the grill for quick trips , but I have other grills that I prefer on longer outings and prefer to place away from the camper: safer and smells less likely to get inside.
2015 Shamrock 231KSS, Oyster shell
2016 Chev Silverado LT Z71 Ext. Cab, 4x4, 5.3L V/8
Reese Straight Line WDH, 2000W Honda Gen.
2 Old Town kayaks & 2 Boston Terriers - Zoey/Gonzo
Lar & Ruth
55 nights camping in 2015, 45 in 2016