This work vehicle from Tamiya does not require you do do any assembly before driving it. The product's scale is 1:48.
From Amazon
TAMIYA 300032593 Lorry Truck
Model Bau
Tamiya 1/48 HEAVY TRACTOR SS-100 32593
Howleys Toys
Tamiya 32593 German Heavy Tractor SS-100 Model Kit Scale 1:48