This work vehicle from Revell does not require you do do any assembly before driving it. It comes in a 1:18 scale.
From Amazon
Revell Control 23488 Mini Remote Control Claas 960 Axion Tractor With 40 MHz Control,1:18 Scale, 9.5cm in length
Conrad Electronic
Revell Control 23488 Claas Axion 960 1:18 RC scale model for beginners Electric Agricultural vehicle