Unless your State/locality has some restrictions I would suggest getting an F350 SRW over the F250. The cost is minimal at less then $1K price difference between the two.
That would preclude the need for any suspension add-ons as the 850 and I would presume the 950 are not as light as people think simply because they are pop-ups.
Whether or not the unit will work for you depends on what kind of camping you are planning. Paved roads going from camp-ground-to-campground? Extended boondocking down dirt roads? Sleeping in Walmart parking lots?
2007 F350,SC,LB,4x4,6.0/Auto,35" tires,16.5 Warn,Buckstop bumpers
2007 Outfitter Apex9.5,270W solar,SolarBoost2000e,2 H2K's,2KW inverter,2 20lb LP on slide out tray,4 Lifeline AGM bats,Tundra fridge
95 Bounder 28' ClassA sold
91 Jamboree 21' ClassC sold