(PICS) Although IXO (and its subsidiaries) produce many 1/43 American trucks................
The real 'high end' precision diecast truck manufacturers seem to have mostly stuck to 1/50 scale, I suppose because that scale is the defacto one for construction equipment diecasts as well. Up until 2013, the most prolific of the precision diecast American truck manufacturers was TWH/Sword who also made lots of incredible construction diecasts. Some of their American truck models seem to have been carried on by WSI, who usually make 'high end' European truck models.
Following are some examples from TWH/Sword's glory days. Their models typically had a plethora of opening and articulating details and yet their 'shut-lines were always super-tight. Their models were not inexpensive, but they were, at the time, quite reasonable considering the exceptional quality and somewhat limited production.
Sword's Mack Granite trucks with bitumin spreader, field equipment lubrication, and flatbed/dump bodies
Seagrave articulated ladder truck, two Pierce Quantum pumpers, and an Oshkosh Striker airport fire emergency truck
A couple of Oshkosh airport sweeper trucks
Oshkosh Airport snow-blower, Oshkosh ant-eater style cement mixer, and Oshkosh dump trucks
Vermeer 'tub-grinder with Peterbilt tractor
Oshkosh heavy equipment transport and Oshkosh HEMTT
Peterbilt field equipment service truck and Peterbilt National Crane truck
Kenworth and Western Star heavy prime movers with ballast boxes. These two diecasts were done by WSI, a current manufacturer who also seems to have carried on some of the TWH/SWORD models.