I have my EC 1160 on a 2012 Ram 3500 4x4 Longbed DRW, with Supersprings 6000lb plus Commercial model.
Ram handles EC1160 very well.
I get 13.6-13.8 mpg with my cummins 6 diesel at 60mph/95kph.
Currently having shipped from US a 60 gallon Titan fuel tank, to extend range to about 800 miles/2,300 kilometers.
We are in the process of installing a Porthole window on the passenger side of the Eagle Cap 1160,
So there is window on both sides of the Cabover bed.
I run my DRW & front wheels at 80psi with Camper loaded.
We also have Front Timbrens to stop any porposing.
There is a rear Helliwig Big Wig Sway Ar as well, 1.75 inch model.
Vehicle glides along the road very smoothly.