This model from Carson does not require you do do any assembly before driving it. It comes in a 1:20 scale.
From Amazon
Carson 500907307 Mercedes-Benz 500907307-1:20 Arocs Goldhofer 2.4G 100% RTR, Construction Vehicle with Functions Light and Sound, Includes Batteries and Remote Control, Red
Conrad Electronic
Carson RC Sport Arocs with goldhofer low loader 1:20 RC scale model for beginners HGV Incl. batteries and charger