Dual-sport motorcycle searches in the US sit around 33,000 a month because riders want one bike for pavement and a Forest Service road. A dual-sport is street-legal: lights, mirrors, horn, VIN, title. A true dirt bike with a headlight is not.
Typical US dual-sports are 250–450 cc: Kawasaki KLX300, Honda CRF300L, Suzuki DR-Z400S, Yamaha TW200. They are tall, light, and geared for dirt. An adventure bike (Ténéré, Africa Twin) is heavier, has more wind protection, and is happier at 75 mph.
Highway miles wear dual-sport tires and vibrate your hands. If most of your week is interstate, buy a middleweight ADV. If most of it is a dirt road with a plated return to town, dual-sport is the tool.
Check title, spark arrester rules in National Forests, and whether the used example still has a working speedometer. Best dual sport motorcycle lists that ignore seat height are marketing.