There are more than I thought there were. Knowing little to nothing about heavy trucks, I did not consider the specialty chassis builders that serve the fire truck, oil field, etc. markets.
I should also point out that the Fuso FG 140 is not really a "high-capacity" 4x4 diesel truck. It is, however, a fantastic "low-capacity" 4x4 diesel truck chassis.
The F550 has a higher GVW capacity than the Fuso, and I guess would be on the low range of "high-capacity," depending on what your perspective was. If you're starting with a 1/2 ton pickup, then the Fuso looks pretty darn high-capacity.
I guess I was thinking U.S. class 5 or 6 and up when I started this thread. That may not be fair to people who are looking at this from behind the wheel of a Jeep or a Taco.
However, if you include F550s and equivalent ~19k GVW trucks, as you point out, you'd end up with a ton of listings.
Personally, I'm intrigued by the more obscure, higher GVW 4x4 and 6x6 trucks.
Note: Intrigued often equals "money pit," "lost cause," and "they haven't made parts for that in twenty years" in my world. Danger, Will Robinson.
From Wikipedia: http://en.wikipedia.org/wiki/Truck_classification
Medium Duty
Class 4
The Class 4 truck gross vehicle weight rating (GVWR) ranges from 14,001 to 16,000 pounds (6,351 to 7,257 kg).[8] Examples of vehicles in this class include select Ford F-450 trucks, Dodge Ram 4500, and the GMC 4500.[5]
Class 5
The Class 5 truck gross vehicle weight rating (GVWR) ranges from 16,001 to 19,500 pounds (7,258 to 8,845 kg).[8] Examples of trucks in this class include the International MXT, GMC 5500.[9] Dodge Ram 5500, and the Ford F-550
Class 6
The Class 6 truck gross vehicle weight rating (GVWR) ranges from 19,501 to 26,000 pounds (8,846 to 11,793 kg). Examples of trucks in this class include the International Durastar, GMC Topkick C6500.[10] and the Ford F-650
Heavy Duty
Class 7
Vehicles in Class 7 and above require a Class B license to operate in the United States. These include GMC C7500 [11] Their GVWR ranges from 26,001 to 33,000 pounds (11,794 to 14,969 kg).
Class 8
The Class 8 truck gross vehicle weight rating (GVWR) is anything above 33,000 pounds (14,969 kg).[12] These include all tractor trailer trucks.



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