I almost didnt post this, because your toupee (LOL!) looks great, I hate to say anything negative. And I'm not an engineer so if I'm off base please accept my apologies, but...
It looks like it's sloped from front to back, wont the wind lift it up a little bit while youre driving? The trailer + smoker is probably heavy enough to not have a problem, but that big roof might catch a lot of highway wind, it would make me nervous.
I do love the idea, nice workmanship too.