I Appreciate the lead, but that won't do what I want. I often have gear under the tonneau that needs to be secured. The tailgate will be open to load, or closed otherwise.

 

Well, I see no other options. Sounds like a 6" lift and 37s are absolutely essential!

Seriously speaking though, I don't like to use them personally, but if the boat has a fairly light tongue weight, maybe a hitch extender? Will 12" get you past the gate when it's down? I had to use one (for the exact same reason as you) on my Sierra when I had it. Got my brake actuator just past the gate.

 

It's a bit too heavy for that. Fully fueled and watered is right at 10k lbs.
Que the tow cops.