bolting wood to the floor?

[Based]

I am gonna bolt my box to the floor of my truck soon but idk what I should use. The way I have to do it due to the slope of my floor is I am putting my box on blocks of wood to have it level and I'm gonna bolt those blocks to the floor and the box to the blocks. Should I just use one long hex bolt for each block? Should I use screws? I don't think it'll be possible for me to drill from inside the box into the blocks because of the angle so I'm thinking it'll all have to be done from the bottom up. Thanks guys. I'm honestly not really expecting these bolts or screws to hold my box down in the case of an accident because the box plus subs weighs around 600lbs but I just want it to not slide around as I'm driving.

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[Based]

hellooo

 

[mlstrass 5,000+ posts]

I would bolt the wood to the box and use "L" brackets to attach to the floor