Uh, Yeah, No. Longer is good, but if you're overhanging it could be problematic. Unless you plan to extend the whole thing down to the bumper like a8ksh4 did on his Taco, I wouldn't go any further than you have it now. I think those little spoiler kamm things you mention are meant to ensure a clean separation of the air, just an abrupt 77° thing you have going now at the back will work great, no need for a spoiler thing unless you like it cosmetically, but I wouldn't go more than 3 inches or so with it.
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