Speaking with quite a bit of coilover experience having rebuilt/installed several setups over the years working at a 4x4 shop, I can say they can be set up to handle weight well more than an obs could dream of, actually owned a setup at one point I was gonna run, but didn't like the extra lift it would have put on my already 9" over stock dually. Take a look at fabtechs dirtlogic 4.0 kit. That's what I had.
The real problem with a coilover setup on an old body style and using it for work is the characteristics being so much different than what people are expecting in a work rig. They soak up bumps rather than translate them, and if you make the spring stiff enough to alleviate body roll,don't actually make the ride Comfort better.As well as cost effectiveness. It's just not logical really to put a $10k suspension on an $8k work truck. And those are realistic numbers even for cheaper true setups even with Fab skills.
Ive beaten the ttb tire wear horse to death, there are no bad ttbs, only bad/misinformed ttb owners.
If you're looking for a cost-effective way to improve turning radius, follow Ford's example with the later "widetrack" super duty trucks. Get some very high quality wheel spacers, a stock f350 (strait, instead of factory 250 minor drop) pitman arm, and shorten the steering stops. Then you turn great, and handle better too.
I personally just put a super duty could sprung 60 in my truck. Turns circles around my ttb, but not an install for someone with no Fab skills and a light wallet. You have to have one or the other haha
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