My '00 Ford F-350 Superduty diesel only had a 4,900 lb front axle rating. I had to install F-550 front springs in it just so I could plow snow without bottoming out. Here's a picture of my old Ford with only a 8,000lb trailer. Notice the squat, even with a 2" rear lift kit. The front is nose high even with very little tongue weight. I never should have altered the suspension on mine. Even at stock height, I was envious of the GM HD for loading/unloading.
Another thing I dislike about Fords is working out of them all day. They sit so sky high you practically need a step ladder to get materials out of the bed. It's no wonder they have the "manstep". The truck is practically inaccesible without it.
Thing I like about the DMAX engine is it weighs ~400lbs less than the Powestroke because of use of aluminum. It enables the GM truck to carry more weight on the front axle, or equal a Ford with a 400lb or higher front GAWR because the DMAX is 400lbs lighter and the front axle components on the GM truck are lighter than Ford's. I find the GM's have a lower tailgate height, so after the hundredth sheet of 5/8" plywood, your back is still feeling OK. I couldn't imagine going back to the Ford-type truck again because of the height alone. My knees & back would be shot. Seems like a lot of guys switch to GM's in their 40's just to trade the jacked up macho look for a more ergonomic, easily accessible smoother riding truck like a GM HD.
Here's my '07 GMC 3500 4x4. Sits dead level.