Alright. $25 worth of scrap and the project is done. Here's the front mount:
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It's 1.5" angle and 9/16" rod. The rods sit back 2.25" from the bolt holes in the floor and about 4" up off the floor. This allows for enough room for the seats to still fold forward behind the second row!
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Fully welded and bolted in with washers.
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Rear mounts were very simple. Welded up the whole bracket except for the cross bar. 1/2" rod was placed in the seat mounts and tack welded to the bracket so the spacing was right.
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Had my boys test it again and it looks great. With the seats folded up there's about 4.5' from the seat to the closest part of the tailgate. Probably two feet with the seats down.
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LOTS of legroom. Both my boys and the dogs have space back there.
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