Did it twice.
Once from Worcester, Ma to Hickory, NC; and the other from Vincennes, In to Hickory, Nc.
(The reason I told you this is so you can look at the routes. Mountains both times.)
The 3.4 did great. Obviously, you'll feel it back there. You're not going to be setting any off the line records.
Once you get going, the truck does great.
Remember, it's all about how you LOAD the trailer. HEAVY STUFF UP FRONT.
I made the mistake of driving all night to Mass, and let the girl and her brother I was moving load the trailer. That thing handled like crap at anything over 60.
I loaded the trailer from IN to NC, and was doing 90 going down the Indiana roads(flat, no real hills). Was that smart, hell no, but it surprised the shit out of me when I looked at the speedo and the trailer was still tracking straight. Lol.
Hills and such are going to be a fun time. I would floor it going from Mass to NC, and by the time i got to the top of the other hill, I'd be doing 45.
Going up the mtns in NC, I took it slow anyway.
Don't gun it up the hills. Good way to blow the motor and/or trans.