Pool noodles, you know, those flexible styrofoam tubes you buy in the kid's dept in Walmart. Place those across the windshield and the sound bar, tie down the canoe/kayak to the front tow hooks and rear spare tire (Note: NOT to the front spare tire. J/K...I've had a few too many at the time of writing.).
Cheap, easy, voila! Works for my kayaks.
2008 2-dr Rubicon, auto,
RK 2.5" Max Travel lift, Fox 2.0 shocks, 37" Nittos, 5.38 gears, River Raider skids, Warn VR8000-S.
RIPP Gen 2 Stg 2 Supercharger.
Bunch of other junk.