Scag 52,your really working that truck! 3 things you want to watch for on that truck when your overloaded that badly,and you are grossly overloading it...lol. The rims,youd be better off with steel wheels,your way beyond there ratings,the rear axle,the 10 bolt 8.5 axle is pretty weak,if it ever goes out consider looking for a 14 bolt 6 lug to replace it,they cane in 2500 trucks with 7200 gvwr and 1500 excabs with the F44 HD chassis package,that rear also has larger brakes,which help with stopping a lot...the last thing is the rear spring hangers,keep an eye on the mounts where the shackle brackets mount to the frame.I had a 1992 heavy 1/2 ton that i loaded like you do,(loaded V box salt spreader)it had a beefier rear axle,I put in 1 ton springs,so i wasnt afraid to load it,well the shackle mounts bent at the frame,and made a real mess....i should have done air bags or timbrens,it would have spread the load over the axle as well as the front and rear spring mounts,as you are now...
thank you for sharing ths pictures,most ppl wont beleive what a 1/2 ton chevy can do,no believed me til they seen mine....