Chevy Suburban - Over 2 million sold and still number one. There's a reason.

Chevrolet began production of its all-steel "carryall-suburban" in 1934.[6] GMC brought out its version later in 1937.
The Suburban was available in both passenger and cargo versions, offering optional side and rear access doors or a tailgate, as well as a Canopy Express with an open cargo area. This versatility made it a popular choice for various commercial and personal uses.
Priced just under $700, which is about $16,200 in 2024 money, the Suburban was powered by the Chevrolet Stovebolt 206 cubic inch straight-six engine producing 60 horsepower at 2300 rpm and 125 lb⋅ft of torque at 1200-2000 rpm.
The redesign in 1941 made the vehicle two inches longer and increased its weight by a couple of hundred pounds to around 3,500 lbs. Chevrolet versions of the Suburban were equipped with a 216 cubic inch Stovebolt six engine, producing up to 90 horsepower, while GMC versions used a 228 cubic inch engine with 93 horsepower. The Suburban was still offered as a two-door vehicle, with a choice of side-hinged rear doors or a tailgate and hatch.