My 6.2 seems to struggle up a steep hill empty,especially when you started off from a dead stop at the bottom of it--stays in second gear until you hit at least 35-40 mph,and it takes a good 1/8 of a mile to get it going that fast...but taking off on level ground isn't that bad,it seems to scoot right along..not as brisk as a 350 gas engine,but acceptable...barely..
I've had 250 straight sixes that would beat it in a drag race..
Merging onto a highway can be a butt clenching experience though,especially if you had to stop at the end of the on-ramp.....it takes its time getting up to 65 mph..cant get out of its own way..when you have a semi bearing down on you at 70+ mph,you'd better hope he either hits the brakes,or can go by you in the passing lane..
The six cylinder trucks I had were about the same deal...
I'm not sure what gears the truck has but they seem high,like 3:23 or 3:42's...I wouldn't want to tow anything heavier than a tent or utility trailer with it..
Once I did borrow a car trailer to haul a junk car to the scrapyard --glad it was only 5 miles away,and no steep grades between where the car was,and the scrapyard..
I had people behind me flipping me off and honking their horns...car was only a Escort Wagon ,the trailer was a heavy home made job though..the slight uphill grade on the way home made the truck bog down to 35 mph from 55 mph very quickly..