Webber and Char-Broil seem to be the best choices..
I recently saw a question about the Big Green Egg (would you pay over 1,000 dollars.. answer NO) I have a Coleman Road Trip.. Nice on paper. Enough heat for BBQ. but NOT for grilling.. (BBQ is long slow cooking, Grilling hot and fast).
I prefer HIGH pressure NOT mounted on the RV.. I use an Extend-a-flow so I use RV propane. but I don't want the grill mounted on the RV.. I want it away for assorted reasons including cleaning.
I'd go with the Webber line.