Visually similar to the taller (by 10 in (25 cm)) CXT, the RXT was derived from the smaller International 4200 (later the Durastar), a Class 6 medium-duty truck; the line was offered solely as a four-door crew cab.

Alongside its lower hoodline, different grille, and flush-mounted headlights, the on-road-oriented RXT was fitted with body skirting and an aerodynamic front bumper.

In contrast to the severe-service underpinnings of the CXT, the RXT was fitted with a 6.0 L VT365 turbodiesel V8 (the 6.0L Ford Powerstroke V8); a 5-speed Allison 2200 automatic transmission was standard.

[7][9] Alongside the debut of the production RXT, International unveiled the ProjectXT concept truck at the 2005 Chicago Auto Show.

In contrast to the CXT and RXT, the MXT was not derived from an International production line, instead sharing a number of elements from its military namesake.

The design and development work for the vehicle was done by an International Truck subsidiary called Diamond Force Engineering, located in Dearborn Heights, Michigan.

Sharing its crew cab with the CXT (and multiple International truck lines), the purpose-built frame of the MXT allowed it to sit 17 in (43 cm) lower.

The front fenders were revised for optimum ground clearance (raised nearly to the hoodline); the MXT sourced its headlights from the 9000-Series trucks and its grille from the DuraStar.

The MXT shared its engine with the RXT, using a 300 hp (224 kW) 6.0-liter VT365 turbodiesel V8 (instead using a 5-speed Allison 2000 transmission); full-time all-wheel drive was standard.

[12] Distinguished by its monochrome exterior, mesh grille trim, and non-commercial side mirrors, the MXT Limited was also fitted with an upgraded interior.