FORD 2006 F-550 Truck Upgrade

We really need a roll eyes, head bonk, type emoji for responses like this. 
But I gotta say, u Frod fans sure are a loyal bunch. OMG. Defending a 6.0no is like idk, can’t describe it. 
Sure some ran/run without lifting the heads, blowing the EGR or oil cooler etc. But even those are still orders of magnitude more finicky than the competitors. 
And to the “I know of 3 of them running strong to this day….” comments, I can only think back to oilfield work up on the Slope when companies were trying to baby along their pre 07 diesels due to the problems with emissions and idling extended periods. So one of our partners had a fleet of “old” 6.0s and LB7-LBZ GMs. Because Dodge didn’t make a crew cab and their transmissions sucked. 
Roughly equal numbers of both brands. 
On one side of the shop there were 2 or 3 engines lined up. Like 1 new and 2 blown.  Those were the Dmaxes. On the other side there was like 20-30 6.0 Flowerjokes lined up. Like 20 blown and 10 new for the next 10 Fords that ate themsleves. 
No other explanation needed…..

Nice low milage for the age, that would be a 25K or higher truck up here. that motor should be perfect for hauling your camper..  you'll get better fuel milage also  what's the height difference between your old truck and the bed of the new one?  

I don't know about the bottom end thing, ill have to read in to that and take your word on it, but they did have the weakest head bolts out of any ford diesel and that's where the issues always came in, to much power added made to much cylinder pressure and then you blow head gaskets.  a good after market stud kit fixes that, or just leave it stock.  the 6L was a ok first attempt for a 7.3 replacement but it fell short in a few areas that's why it was short lived and the 6.4 was brought in.  the 6.4 had issues of its own, but when deleted and tuned it was an absolute beast of a motor, but the 6.7 came out and is going on 14 years now with only updates and no major redesign..  any of them in stock condition are capable of hitting a million miles if taken car of, and if built properly any are good for power and lasting.  personally the 6 and 6.4 didn't have enough of a benefit to entice me off my hopped up 99 7.3 diesel , but my 2014 6.7 blows that old 7.3 out of the water, even though the 7.3 had more torque and HP than my 6.7

ya I could have said how many mils on the truck.  that is very low milage and if its stock for what he does it will probably be the last truck he will need.  I have never seen an 06 dually that clean or that low milage so I assumed there might be 3-400000 miles on that 6L.  like I said before there are several stock 6.0L that are million mile motors, the issue came up when you hopped it up.  6.4L could take some hopping up but not as much as the 6.7L   so if he is planning on leaving ti stock it should be fine.  

if I had the choice between a 07 6.0L and 6.4L  I would jump on the 6.4.  the head issues were fixed and once you delete them the milage and power is incredible. you will never get that out of A 6.0L.  I have friend who has three 6.4L's now between him and his two boys..  the only pain is you have to lift the cab for some jobs but if you have a hoist it takes like 15 min to do he says.  that is usually a 10 to 20K (CDN) truck up here but I think that it would get more having that low milage.  Up here a dodge is way, way cheaper,  they are the cheapest of the big three diesels you can buy, doesn't matter what year.   when I bought my true I decided to be no partisan between the big three, the dodge was ruled out immediately, just felt slow and lacking in the power.  I know its because the inline 6 doesn't rev as fast but that did it right there for me. I found a dually dmax but they wanted 15K over the blue book value and the sales staff was kind of ignorant when I pointed it out so we left and that truck sat on the lot for 4 months after that.  we ended up getting a two year old fully loaded for a steal, about 1/2 price of new F350 platinum.  more than we needed but it was 7 years newer than the dmax and it was only 5K more, because of their inflated price.  I still wish I had found a dually though.