Rick, while I love my Q grill that portable cart is a not a great platform for a grill. It is not sturdy and wobbles when you clean the grates.
Here's a thread about the carts:
I like post oak for brisket. There is a local craftsman that makes things out of Makers Mark oak casks and he sells the scrap pieces. That has been my go to lately for PP and meatloaf. I haven't tried it on a brisket yet.