Glad to help Rhodesia.
I still wouldn’t do the super springs either though unless you’re wanting to get rid of the airbags.
But again, drive it first before moving further with more mods.
Admittedly, that generation of F250 has fairly compliant rear springs. Based on the 2012 and 2015 models I had. You could lob the camper on there now and drive away and not be sitting on the bump stops. But the springs have a softer initial spring rate compared to what one would traditionally think of a HD truck.
You have more than enough tire (and rim if OE rims or at least not some cheap aftermarket ones) for the camper to sit on the truck for a day or 5 years. 19.5s would be overkill.
For frame of reference, we had Arctic Fox 860s sitting on a 2007 Dodge 2500 short bed.
4000lbs + ready to camp. Yes it needed airbags, sway bar and home made spring wedges. And with that it handled decent. But first trip out of the Gates with the first camper was camper loaded down heavy and a 7klb trailer on a 2’ hitch extension from Seattle to Anchorage. Just airbags and some 4000lb rated Toyos.
Took all 748 frost heaves between here and there like a champ!