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Just my thoughts on smoked burgers....
The last time I did this I grabbed some marked down ground chuck 1/4 burgers and some mammoth size Avocado's (like the size of small footballs). Smoked for a couple hours with Hickory and the Hen Mallard made some guacamole type dressing with those Avocados. If you never have tried Guacamole with your burgers you are missing a treat. There is something about that flavor combo of the Hickory, beef, onions and the Avocados that turns out excellent. Another thing is, grilled hamburgers NEVER re-heat well, NOT SO with smoked burgers...they re-heat great and maybe taste even better.
Humbly submited.