Mega sh 2500 hemi how much can I tow comfortably

I have a 2011 mega cab 2500 5.7 hemi. I have a 2025 coachmen Catalina fb223. Dry weight of 4,400 lbs I pull it easily. I want to buy a bigger TT WITH A SLIDE. THE ONE IM LOOKING ST IS A DRY WEIGHT 6,4...