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Originally Posted by Gschuld
The difference at 75 and 80 mph is striking. Aero matters…..
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Sure does
Around 65-70 is where you'd usually really start to take a rather obvious hit on a "normal" (ie really non-streamlined) vehicle
Quote:
Originally Posted by Gschuld
What gives me some pause is cross wind effects.
Sway control in particular has my attention as my as designed single axle distance to hitch is on the short side and I sure don’t want it to be dancing around back there at 75-78mph
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What do you call
on the short side ?
In the US, axles are way too far aft for European eyes
In EU, we have the axle more towards the middle, try to centre weight on the axle as much as possible, and balance weight on the axle with a slight forward bias - say under 100 lbs on the hitch.
I lift the hitch over the ball by hand as a weight-balance check on my single-axle trailer (1650 lbs MGW).
More side-area forward of the axle, say to cover the hitch-gap will help to even out the side-area fore & aft.
One of the members here once made an
aero trailer with a circular aft end.
DON'T do that 
It induces instability and drag, as air flowing over it will result in a force pulling outward & aft - Coanda effect.
The forum member pulled it off alongside the road IIRC ...
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Weight, yes, no way around that.
This is also where I suspect the overpowered 6.2 475hp Hemi comes in handy.
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Shouldn't have much trouble with it
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The wildcard, for me, is the “ECO” 4cyl mode on this Hot Rod engine.
But I doubt the engineers would have gone through the trouble if it didn’t have some benefit.
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Always ask yourself where the benefit is with these things
Auto stop-start was getting used because the European driving cycle (NEDC) had cars @ standstill for large parts of this unrealistic test ... so it dropped the fuel consumption significantly during the test.
In real life, nowhere near as much.
Even half that HEMI is still a 3L , 240 HP engine