This 1960 prototype was designed to increase the load capacity of the Land Rovers. With a payload of 30cwt it was aimed at military applications as well as civilian use - some of the vehicles were tested by the Belgian Army.

The 129" prototypes used a four speed gearbox and power came from a turbocharged four cylinder diesel engine or a six cylinder petrol, chosen because it was Rover's most powerful engine at the time.

This pilot never made it to full-scale manufacture – too many non-standard parts and too large a vehicle relative to the improvement in load carrying capacity. It would be the forward control models that would make it into series production. Of the six 129" prototypes, two still survive.