At the 1970 Paris commercial vehicle show Willème showcased their first 6×4 tipper chassis, powered by Volvo's 270 hp (199 kW) engine supported by a Fuller 13-speed gearbox.

[8] PRP continued to manufacture heavy-duty trucks like the TG 100, 200, 250, and 300, offering them with Cummins, GM, Caterpillar and Mercedes-Benz engines capable of high payloads.

[9] TG300 was the most powerful truck offered by the company, a ballast tractor promoted as being capable of towing 1000 tonnes with a suitable hydraulic modular trailer.

In 1979, Belgium's MOL acquired the design rights of the TG range from PRP and continued to manufacture heavy-duty ballast tractors mostly in 8x8 configurations with Cummins engines, with towing capacity of 300 to 500 tons for oversize load transport applications.

[10] In 1980 Creusot-Loire used the TG range of trucks as the basis in developing their T40A military tank transporter, an 8x6 configuration powered by a Detroit Diesel engine supported by a 13-speed Allison transmission.