You will be fine for local and small trips but long trips you will tax the Hemi and find it's limits, they aren't designed for the work required pull that much weight and more taxing is the wind you'll be pushing.

Hopefully your running a weight stabilizing hitch and a sway bar, that will make it as safe and stable as possible and extend the limits of your 1500 but if you take frequent trips over 100 miles loaded you'll kill the Hemi unless you stay off the interstates and drive 55mph and when you come up on hill you don't expect to maintain your speed.

I killed my 1500 trying to pull my first 24' trailer on the interstates and I was under 7,000lbs and didn't have the extra 12" height.

So don't get in a hurry and try to stay local and you'll be fine.