Mounting RCM battery trays

[jnev]

How is everyone mounting the RCM battery trays from Mike to the chassis? I saw the included screws and could just screw the tray into the chassis, but I am not sure that will be strong enough. Has anyone used other screws that work better than the ones included? I could potentially also use a nut on the other side of the tray to hold the screw in the tray, but then I will need a spacer and will need to change a lot of other things as well.

Ideally I would just want to have some screws into the tray how it was designed to be, but I am not sure if the tray will be able to hold onto the screws. It seems as if on a hard hit, the tray would just rip right off the screws... any recommendations?

Thanks.

- Josh