Has anyone tried (or heard of) this system? Link is here and here is some text:

Why MAXLOADER™ support springs?
*Additional 2500 - 3500 lb. capacity•
Maintenance free•
Level loads•
Better handling and control•
No adjusting needed•
No Clamping bolts•
No Air lines•
No Compressors•
No Parts to rub through or fail •
Less sway•
Less axle wrap•
Less vehicle maintenance•
Factory ride when empty•
Easy do-it-yourself installation•
Cost effective•
**Limited lifetime warranty•
At MAXLOADER™, we believe the consumer does
not have the time or money to invest in a sys-
tem that will eventually fail. The goal of the
MAXLOADER™ system is to provide a cost ef-
fective and safe solution for the user.
MAXLOADER™ is easy to install, reliable in all
situations and will give a lifetime of use.
The incredible design of the MAXLOADER™ sys-
tem allows for support that is needed, when
it is needed. Whether a standard or com-
mercial application; MAXLOADER™ is a cost ef-
fective and safe way to handle heavy loads.

 

http://broncograveyard.com/bronco/c-472
Scroll down to add a leafs they are 75.00 for the big or 79.00 for the shorts
and have been in the business forever!!