I like having more than one burner.
Then you'd have a stroke if you saw the 5 or 6 burner monster I found a few years ago, it's 3' wide and weighs a ton!
Can't say I've used that one though, the old reliable 2 burner has been doing it since Dad bought it 50 years ago, although I did switch to a propane version a couple years ago, much lighter and more compact, and no pumping, "must have coffee NOW!", it still fits under the jump seat but it's 1/2 as thick.
I too prefer to cook outside, bacon stinks up the bus and leaves a film on everything. I have boiled water for hot dogs or beverages inside when it's pissing down outside, that fogs it up pretty good as well.