of the DuraStar. Second generation (International MV; 2019–2022) For 2019 model-year production, the medium-duty DuraStar product range underwent its most extensive revision since its 2001 debut and was renamed to International MV. In line with revisions to International Class 8 product lines, introduced a number of updates to the cab interior. Externally distinguished by larger doors and side windows, the MV replaced the quarter windows of the DuraStar with a single-piece side window with a lower windowsill. The dashboard underwent extensive changes, with the previous instrument panel replaced by a reconfigurable digital display. The International MV continues its use of Cummins diesel engines, with the Cummins B6.7 and L9 offered, depending on configuration. Third generation (International MV; 2023–) The International MV was redesigned with a new front end for the 2023 model year Variants The International DuraStar shares its cab design with several International product lines, including: the TerraStar Class 5 medium-duty truck, the 7000/WorkStar severe-service trucks (renamed the International HV), the 8000/TranStar regional-haul semitractor (renamed the International RH), the ProStar aerodynamic long-haul semi-tractor (renamed the International LT), and the LoneStar semitractor. Bus Like the 4000 series before it, the DuraStar serves as a popular platform for bus manufacturers, with two configurations sold for bus production. The International 3200 is a cutaway-cab chassis; the International 3300 is a cowled chassis. The former is sold primarily for commercial applications while the latter is sold nearly exclusively to Navistar subsidiary IC Bus, for both school bus and commercial applications. Diesel–electric hybrid trucks In 2007, Navistar International became the first American truck manufacturer to produce a diesel-electric truck, with the International DuraStar Hybrid. International Truck and Engine teamed with the Hybrid Truck Users Forum (HTUF), a consortium of utility industry customers, Eaton Corporation, the US Federal Government and the Calstart organization to assist with the cost of bringing the technology to market. It also provided direct customer feedback and support. Pickup truck From 2005 to 2008, International sold a factory-produced crew-cab pickup truck variant of the 4000 series. Named the International RXT (RXT=Recreational Extreme Truck), at 272 inches long, the truck was the longest-length pickup truck ever produced.for sale in North America. Unlike the 7000 series-derived CXT, the RXT was rear-wheel drive, marketed towards customers with large RV, boat, and horse trailers; both trucks source a pickup truck bed from the Ford F-350 Super Duty. Derived from the 4200, the RXT was powered