If you are a weekend warrior, carrying a grill of some sort might make sense. I was a full timer for a couple of years and now typically take trips of several months. With full time or extended travel over different seasons, space becomes important.
At one time I tried to use a grill with a small bag of charcoal. That pushed available space and was really messy.
I kept the wire grilling surface which I can use on campground grills or fireplaces. I also have folding marshmellow/hot dog cooking forks. Cooking over an open fire can be a lot of fun with added flavor. I can recommend both for anyone who has limited space. I won't use a propane grill even at home. I am old fashioned enough to stick with my Weber kettle charcoal grill.