Not to revive an older thread, but since I have the same truck as you I thought I'd share a pic! I have a Colorado short-box and use the Yakima bed Extender. It works really well for my Passport 12. I do have to put it in upside-down and I put pool noodles under it to keep it from scratching on the bed-liner. But it's super sturdy and I have no issues on the highways. The Yakima is a little on the pricier side, but I keep it on the truck folded up 24/7 and it hasn't been a problem.
Note: I did have to buy the padding separately which kinda sucks
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