sledge 
I have a ford 250 it does sag a bit. Its a gasser and I bought gas for some of the reasons you mentioned: ease of maintenance, parts, starting on cold mornings, the list goes on. My next will be a Ford 350 or even 450 diesel. I feel like I want more towing power, plain and simple.
Others have touched on stopping power and such. Id like to say a word about your hitch. Most factory hitches are 3 ton or less on 250's and down. I don't mean the ball I mean the actual hitch. Check your rating on the actual frame of your hitch. I upgraded to a 17,000 hitch. Its a beast; my trailer capacity is 14,000 even though my truck really shouldn't pull that much I know that hitch pulling wont give before the truck does.
Im also interested what others have to say about suspension. I've checked out airbags, leafs springs, shocks, anything that may even remotely help with sagging.
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