I had the mid size Weber Q grill, but recently gave it to my son-in-law.
They are built like a tank and cook well, thanks to a heavy cast iron grate.
I carried it along with a 20lb cylinder and hose, but grew tired of the both the grill and tanks high weight.
The O-Grill also has a cast iron grate but the rest of it while well built is lighter, folds up smaller, and can be carried in one hand. Also, the way it's regulator and propane hook up is made its easy to convert
it to use a LP propane port on your RV.
That's what I'm doing so I no longer have to haul the 20lb cylinder, or 1lb bottles.