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Without a doubt, dual cabs are the most susceptible to his problem, their design is such that for decent ramp over there is naturally more tub or chassis / try hanging behind the rear driveline than in front.
It sure isn't limited to the Triton, but they are one of the most notorious culprits to having this issue, pics make that clear as to why.
Their departure angle is also terrible.
My post here
http://www.4x4earth.com.au/forum/general-4x4-discussion/35273-tray-touring-setups-2.html#post450070 shows pics of some very suspect vehicles.
The Iveco Daily shot shows how good they thought it out, my Ranger would probably be one of the best placed rear drivelines / leaf supports of the dual cabs, pic of that put in there for comparo.
I have extra diesel tank up front of tub and water tank centre slightly forward of rear axle, helps with keeping weight forward even on big trips.
The 100 dual cab looks like a converted wagon, but is very poor in engineering (wonder if it was engineered if a home made dc ?).
It and the red Nav both look slightly bent already too.
Even the Hilux Extra cab had issues because of that camper back and possible extended chassis.
Anyway, careful loading with heavier items up front of diff, and some thought as to addition of rear racks / what's carried and where, should see most vehicles not have issues.