I'm going to be trying out a windshield lightbar mount that does not require drilling into the exterior of the truck. ( the mounts are hidden ) If it works, I'm certain the vendor will happily sell brackets.
It should go on within the next few weeks with some dirt testing at the end of August.
we'll be putting a BD 60" arc bar on the upper windshield.
I think your best bet would be one of the m-racks and then make a custom bracket to put lp6s up there.
I wanna see it.