Morbius,
Sweet!!
I am envious of your install.
I have a Reese 20K in mine (an up grade from my 16K) Dual pivot heads are the only way to go. I did a similar install, on the 07.5, I have a Dodge bed liner, when it finally warps and starts to crack I'll go back to a bed mat. What are you using for air?

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07.5 3500 Quad, SRW, 4X4, Laramie, Leathered, Dark Metallic Gray, 6.7, 68RFE, 20K Reese, Ride Rite's, 2 Viair air compressors, Bully steps, Kleinn Locomotive air horns (5 in all), Billet polished locking fuel door, 'A' pillar mount Auto Meter Pryo, PML X-deep trans pan
06 Durango 285 RL 5'er Lifted by KZ