Jack I know you've been looking for the post, here it is:
Greyhound Rig Pics Prairie.
There's two methods. One, Jack's is a professional system that will SOLVE the problem and is the best solution. You'll draw enough smoke.
The challenge may be installation, cost, weight, power???
In my comp rig I really want to mount both my smokers, but to put in a full vent hood is more than I want to add, for now.
It's easy enough to vent the vent outside with tubing, the challenge is, like you said the smoke that comes from opening the door.
Don't forget to cover the floor, grease/food will drip and fall there also.
My cheap solution was to create a postive airflow. I have a fan blowing and the back open enough to blow the smoke out. Not a solution for rainy days or cold days, but it works.
Let us know what you do and send photos.
Good luck.
Russ