What is notch the frame? How do you do that?

lol Mike, i already hauled 2 X 700 lb dump runs with my beaut! you could tell she had a load, but i never bottomed out... i didnt drive like an ass either though. this truck just has 2 leafs (1 main and the overload (smaller) im guessing?), and a 2" square metal for drop block. she'll get a new set of shocks in spring when i pull the box.