Replying to Speed Wobble

Hey all you longboarders out there, I've got independent 215 trucks on a 40 inch board and just crushed myself yesterday straightlining a hill. The whole board fish tailed and i cartweeled at least three times. Anyone got any tips to prevent this, I've heard Randall trucks are better. Any help would be great, thanks.

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'Don't let academics interfere your education' (My coach)

'I'm in his nigger crew' (my little brother in response to my statement that he was in my 'digger crew')

'My knee hurts' (Jeff Merat after grinding a lunch table for an hour instead of sitting in the ski patrol shack for his torm mcl and acl which he got earlier that day.)

'I'm not asking for any help, just mabe for you to get off your ass.'(my dad)