Spotted at the Shizuoka Hobby Show by Hobby Blog, these are life-sized vehicles that appear in the Gundam series. Mechs don't ride in these, people do!
They're actually reproductions of Gundam models (UC Hard Graph series). The vehicles are made from real cars (Mitsubishi Pajero and Mitsubishi Ai) and are fan-made projects.
GUNDAM UC Hard Graph LAKOTA in scala 1/1 allo Shizuoka Hobby Show 2011 [Hobby Media]