ATS - International HX520 Truck

Changelog:
Update for 1.46

fully functional truck
3 cabins: daycab, 56 and 73 inch High Rise Sleeper,
6 chassis lengths, from 212 to 300 inch wheelbase, 6×4, 8×4 and 8×6,
6 fuel tank volumes, from 100 to 280 gallons,
6 Cummins X15 engines,
Elite Diamond interior,
a few customization options,
3 predefined configurations available at International dealer,
available for quick jobs (including separate configurations for heavy and oversized cargoes).

Authors: SCS, Harven, Kriechbaum, Klunk, Pauly, Lucasi, SirBlackyAlot