My experience all is based on from work of mouth from dads friends that use their trucks for work, and my dumb cowboy buddy.
Dad's one friend is a diehard Ford guy, bought a 6.0, got crap mileage, and had problems constantly, drives his 02 7.3L mostly now.
My buddy treats his trucks like shit, and needless to say, after hitting a deer at 90 mph, the ol girl took it like a champ. after jumping a dirt road, the ol girl took it like a champ. but when we were cleaning it up to get the front end repair estimate (just bumper and filler) we tried to clean his air filter, and nedless to say, his 5' 2" size was ruled out as mechanic, so my 6'4" size was enlisted, and i was climbing all over stuff trying to get in there, jokes were made in reference to monkey humping a doornob, etc. undid snap latches, seperated housing, pulled, pushed, said f it, buttoned back up and reset filter minder to shut off dash lamp.
Same truck, we got a truck load (shortbed, cab high, 22 bales) of grass hay, about 50-70 pounds, and I was driving (he has DUI, so i am driver

) and it felt doggy pulling hills. a lot of pep was taken out with just a bed of hay and a cab of buddies.
my theory? electronic 6.5L reliability, with repair costs of some types of army equipment, with ease of working on of a front wheel drive transverse engine minivan.
It is a tough chassis, and the 5spd auto is twice the tranny the 4spd auto is, but the poor fuel mileage, hard to work on design, etc drive me away from one.