lol, I wonder who that guy works for.....
First of all the ram coil springs ARE progressive rate springs. Also, if they would have showed the same exact "test" in the ford that they did with the ram with a massive load and swerving all over the road, the ford would have done the exact same thing, probably even worse actually (as the leaf spring suspension will not handle as well). It is purely false that coil springs can't handle a heavy load. As any of the guys on here that tow with their trucks, they will tell you from experience. I also know that my father in law with his F150 towed a 8,000 lb pull behind up to Arkansas and he said shortly after leaving he had to crank the sway control bar on the hitch ALL THE WAY down to get it to feel stable. Shouldn't have to max it out....the ram would do a better job if you really look at the geometry of the suspension it's clear as day.
Breathing in and out is good enough for me.