The International 4400 was what I was going to replace my F450 with. Though I was only towing 17,000+ lbs it was day in and day out 30,000+ miles a year which beat that F450 up pretty well.This is what we use. 2011 IH 4400 with a 20,000 lb rear axle, air brake, air ride, air suspended cab. It is still a rough sob to ride in and I would not be happy using it for daily duties. It was $90K new plus the custom deck. If you're going to use a gooseneck or a fifth wheel over a flat deck you will want to order a low profile unit. ( like how you see rollbacks configured. )
I would also stay far away from any IH engine.... We have had three major repairs in 30,000 miles of easy use. Two of which were not under warranty.
The tractor on the trailer can weigh up to 19,000 lbs depending on how it is configured.
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This is what it replaced. 2003 F-550 with the max towing option, which I believe was 30,000 lbs GCWR at the time. In this configuration the tractor was only 13,000 lbs. The truck pulled the weight fine, but the trailer brakes were always problematic. I got pushed through an intersection in the rain on one occasion...
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