Yeah I take the water bowl out to manage the coals easier. It's kind of a tight squeeze on a 18.5". 22.5" might have more room.
As for the cart... I got it for $8 at the Salvation Army. Came with a cutting board on top. It's great.
UGLY DRUM SMOKER, 22.5" Weber OneTouch Gold, 18.5" WSM (Weber Smokey Mountain)