I have been using air bags only... since Oct 2002... I have no idea why you would need stable loads or any thing else.
Some people add everything they can to their trucks... even before they buy a truck camper.... no idea if they need it or not.
The then defend their mods as if they made a difference... and the truth is.... they often make it worse, but who wants to admit to making a colossal mistake?
Most of us know... and just wink and shake our heads, knowing a sucker and his money are soon parted.
Don't solve problems you don't have... solve problems after you've actually identified a shortcoming.
To the op...
In the COG thread and in this thread Reddog1 explained how to use the airbags for exactly what you want. If you'll follow his lead you'll be very happy.
Save your money... use it for PVSolar panels... or fuel for a trip.
BTW... don't chip your truck either... there is no need, it voids your warrenty, and shortens the life of your trucks engine... turns your Truck camper in to a lawn orniment!
Sleepy