Gunny,
The Hondo I just sold had flat head counter sunk fasteners. I'm pretty sure this is the mormal way togo. Also, My boat originaly came from the factory with only one bolt holding each bracket. Over time this broke all the brackets. Make sure whoever installed the bolts took the time to install two on each bracket. Installing two on each usually requires a spacer for the outside of the bracket, on most flats especialy runners, the floor is not flat on the inside. (Stepped). I glassed in some plywood.
Good luck, Post some pic's of the Battle Wagon.
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Morg