offered in LS and LT trims, reserving the LTZ trim for a more luxurious offering (like limousine or taxi-related services). There is no 2WD or upgraded packages. In addition, there are no plans to offer a 3/4-ton GMC Yukon XL as GM is making the design exclusive to Chevrolet for the time being. A one-ton "Suburban 3500HD," which would be a GM-unique SUV, was introduced for the 2016 model year. This is government-exclusive and available in 4WD LS and LT trims only, weighing around of GVWR, 17-inch machined aluminum wheels (8 lug), a high capacity air cleaner, 220 amp alternator, external engine oil cooler, and auxiliary transmission cooler. Although the vehicle has a high GVWR, it is configured to provide a minimal towing capacity and is primarily intended for conversion to an armored vehicle. This version does not include HD radio, nor is there a GMC Yukon XL equivalent, making this version exclusive to Chevrolet as well. The 2020 model year would be the last year for these two features, as GM has decided not to carry them over to the twelfth generation models for the time being. Additional changes Upgrades There was no diesel variant of the full-size SUVs for the 2015-2020 model year versions. GM offered another off-road variant or trim for the Suburban and Yukon XL starting with the eleventh generation. With the relaunch of the Z71 package in the Suburban for the 2015-2020 models, GM filed papers to trademark the Trail Boss name for use on future Chevrolet truck and SUV models, although they were never used for the Suburban trims. Concept versions On November 4, 2013, Chevrolet unveiled a concept design for the Suburban called the Half-Pipe, whose features include roof racks and crossbars to mount skis, at the SEMA Show. Afterwards, Chevrolet made its parts available for order at Chevrolet Accessories. At the 2017 SEMA Show, a 4x4 off-road Suburban concept inspired by Country singer (and Chevrolet spokesman) Luke Bryan based around his 2016 song "Huntin', Fishin' and Lovin' Every Day" was introduced, decked out in custom Hunter Bronze exterior color with Dark Carbon accents and camo graphics, a roof-mounted light rack and a custom lower fascia, a liftgate re-engineered to swing outward rather than upward and incorporates a custom spare tire mount, 22-inch wheels with 35-inch-tall tires, roof-mounted equipment carrier with a fishing rod holder, an interior design consisting of Black and Two-Tone