My 1972 1210 will be our all around farm truck. I will load bales of hay, and it's what I will use to tow junk home with. It currently has a built IC 392, t19, 3.73 gears and 33 inch tires. Brakes will be disc front, and hydroboost. Freeway driving will happen, but not all day, every day. I also have a front Dana 44 and 14 bolt with 4.09 gears. I also have a front Dana 70, and ra15 with 4.88 gears. It's a dually rear end. The 392 and 4.88s will pull whatever I want, but slowly. Especially if I run a 33ish tire. The 409 gears seem to be the happy medium, but it's not a dually rear. My question is this; for what I'm using this for, do I really need a dually rear? Will the 14 bolt and load e tires be good enough to haul with? The heaviest thing I can imagine hauling, is a 20 ft trailer with a d series on the back. Or something similar. A scout, a kb, a m series tractor... Wheel base will be a factor, this used to be a short bed truck. I'd also like to run a 33 or 35 inch tire. Thoughts, and other opinions welcome. What say you?