Don't forget to bring some sun tan lotion and your canopy. Rocketry as we know it could not have progresses as far as it has if it were not for canopies.
I've got a cheap-o Coleman canopy (i cut out the screen sides to allow airflow) as well as a 10x10 EZ-UP (about 60 lbs).
Since I'll only be on the field for 2 days, I think I'll just take the coleman. Doesn't seem to make sense to haul the big one that far.