Smoked meatloaf (not the crap your (my) ma made)
With all the other ingredients there was plenty of moisture and no need for a water pan.
And if Alton Brown says add potato chips, I'll add potato chips. It's just a binder like bread crumbs are in most other meatloaf recipes.
Smoking the meatloaf sounds interesting. I wonder if the recipe would be improved by puting a pan of water under the meatloaf,in between the 2 coal piles. I always smoke using this pan of water and it serves well to keep the meat moist and tender, especially bison meat.
Just a personal prefernece here but if I am going through all the trouble to smoke meat on the grill I wouldnt use crushed potatoe chips in any recipe.