I understand as follows...
With the most recent version of the Ford F-250, the 2021 Ford F250, these are the add-ons offered in the Super Duty camper package:
Rear stabilizer bar—often referred to as an “anti-roll/sway bar,” this feature makes the vehicle feel more secure and stable as you drive and prevents the tires from coming off of the ground. For instance, a heavy load in combination with the speed of your vehicle going around a sharp corner could cause the rear body of the vehicle and the tires to lose contact with the ground below if the sway bar isn’t present.
Rear auxiliary springs—rear auxiliary springs give the truck more support and allow it to carry more weight without the risk of blowing out or over exhausting the primary springs. These are more or less the backup springs, given they are also often referred to as helper springs, and allow the truck to ride more smoothly.
Slide-in camper certification—this is recommended for all Ford trucks that plan on being used to haul a slide-in camper. A slide-in camper certification comes with the purchasing of a camper package with the Ford F250 and certifies that the truck is safe to use when carrying a slide-in camper.
Signature increased capacity front springs—this is something you will definitely want to have on any truck you plan on using to haul something of significant weight. Also known as heavy-duty coil springs or overload springs, increased capacity front springs take on the weight of whatever is being hauled and absorb it. Having your truck equipped with increased capacity front springs increases the load capacity.
