Why Truck Camper need a air bag? Do I really need it?

Here is the part prices:
Torklift tiedowns: front $333.19 rear $383.09
Airbag airlift 7500 $505
Quick release turn buckles $624
Electric Cables $120.

So the part costs about $1965

And they will do all the installation for $2200.

Am I getting good parts?

Thanks.