Since Trent179 would never respond to any of my PM's about his experience with this particular body or response to the questions I asked in the post I just decided to pull the trigger and get one. Had some concerns before I bought it but just said screw it and paid the money. By the way I paid 34.99 at hobby town not the close to 60 bucks through ebay like his link suggested.
Final report: it fits awesome, almost perfect where even the pre-drilled holes almost line up. Just need to make them a little larger so there is extra mm of clearance and perfect. Seems to be just as good as quality as the stock 4x4 body if not better. Looks better, seems more streamlined with a lower profile, appears that it will catch less air and I am totally happy.
You can't beat this price for a already painted body and all stickered up ready to go. Any other body after you paint it, add stickers or buy stickers or even get the pre-painted ready to go ProGraphix body you've spent 60 dollars.
Thought I'd post my experience since there was nothing on the web about this fitting the slash 4x4 truck and no one at a few of the bigger online HS that had a clue or would even help to see if it fit.
They offer other Losi truck themes that are super awesome like the RockStar Energy truck and the red and black ReadyLift truck.
Losi Body Slash 4X4 by freelanceshots, on Flickr