99.5 F250 replacement springs

[dieselperformance1]

ok i have been lookin at my truck and the front springs are fine but my rear springs are taco'd. i was going to do a custom lift i tow very heavy 13k+. for the front i was gonna do the 2'' add a leaf and stack it with the 2.5 zone offroad leveling kit like my old 99 dually had and sat high rode stiff but thats fine. the front will be about 4'' higher but the rear springs are shot. i found some on ebay and was wondering if anyone has heard of them or used there springs.

GERNERAL SPRING in KS
Spring Capacity = 4400 lbs
Width = 3
# of Leaves = 7(6/1)
Measures (A/B) = 25 x 33-1/4
Pack Thickness = 3-1/4
Bushings Included
Sold Per Side - Order Quantity 2 for a pair

from the looks of them they are a heavy i mean heavy duty springs.

i was gonna do the front lift first then get these springs and see where the truck sits. if it is lower in the back then i can resort to a f350 rear block or an extra leaf but i wanted to see if anyone has run these springs. i could go a 4'' lift route but it wont handle the loads.