I looked it up. It is a good looking Pop-up! I'm pulling close to the same weight however I get the wind effect that reduces MPG. I don't travel too far, but with your rig it would be a pleasure to pull.
Just came across this thread. I have the Mopar Diesel lift on my EcoDiesel Rubicon. No problems at all. Mule is probably just under 3K gross. Need to weigh the boat, but figure it at 4K. No suspension related issues at all You could forget the trailer was behind you.