You could get away with it around town… but since you tow up the hat I can see why it wouldn’t be enough. My 40 is about 4700 lbs empty so it’d be a bit light for mine.
The 7.3 drags 9500 lbs over the hat like it’s nothing… so 3.6 for 5000 lbs would be similar… 1.9 for 5000 would be a ton less power.
I know displacement doesn’t necessarily equal torque to drag a rig around, but getting the same torque out of a 1.9 as a 3+ litre would take some doing.
Now if you had an aluminum bodied, soft top 40, and didn’t tow a heavy trailer it’d be a different story. I’d imagine the fuel economy would be a step up… probably even on a 3B.
