Dragging tails and sagging rear ends are the common pain talked about in any jobsite with heavy construction in the world.
The trucks, SUVs, Vans, etc, involved in heavy construction, moving dirt or rock, and other businesses put their stock spring and rear suspension in coma as they get soften with time because of the overloaded stuff.
This poor condition of the spring results in the further damage in the maintenance of the vehicle.
So in this case, a Helper Spring is a necessity.
When the rear spring weakens or gets overburdened and you want to have your vehicle comfortable, nothing can make you satisfied other than a helper spring.
These helper spring allows the shock piston to be placed in the optimal position within the shock body, maximizing articulation levels in the car and increasing rebound stroke with minimal suspension travel.
Therefore they are often called as Overload spring. In simple words, helper springs does not increase the load carrying capacity of your vehicle but give it additional strength and support to carry the goods without damaging its parts.
There are 3 basic types of helper spring: Air Helper-springs, Steel Helper-Springs and Bump-stop-style Helper Springs. Bump-stop-style helpers are not at all expensive and take very less time to get installed. These types of helpers are self-adjusting and maintenance free.
Steel helpers are used in those conjunctions which are having factory spring packs. These are leafs of steel helpers are long lasting spring helpers.
Air Helper spring have a variety of price because of the wide variety of air delivery system. The sophisticated the system is and the more time it takes to get installed, the more is the price.
But these are regarded as the best as they allow you to have a total control over your truck. In the long haul, helper springs are a good investment as needless of the direction you take these strings will not let your vehicle get jeopardized by the weight.