Have done that, what I am looking for is some article or instruction that gives some wieght to my discussion with the customer with regards to the damage carrying loads at the end of forks causes

tolerance standard is 10% loss off material at the heel
so measure the vertical portion's thickness front to back
then measure the thickest part of the horizontal portion
for example : if it is 80mm on the vert than the thinnest the hori part should be is 72mm
there are gauges to measure wear on them

dont let them drag the forks
dont let them hit big potholes at high speed bouncing the product