379 American class, 250"WB. Took off sleeper and installed factory unibuilt back window.This box was custom made for us, but the builder was too slow so I had to finish most myself. It has 800 gal fuel, 3-35gal oil tanks, 1-35gal antifreeze, and 150gal water tank for built in AC power washer and fire protection hose. It has a Bobcat 250 Diesel welder/batt charger. The reels are mostly 100ft COX, but a couple are Hannay 50gal/min fuel reel and a power washer reel. It has 8" bullcut stacks/Auto crane/ac compresser/rear air for dolly/rear hydrulics hookups/pintal and receiver hitch. I made all shelfs,tanks,doors, and finished all welds, mounted crane, and wired. The box was just a shell when I got it. Painted and tons more. This truck supports 4 combines and support equipment. Its my dream truck and I'm still out of room. lol