Tests and army service showed that T - 26T artillery tractors were underpowered for cross-country towing of trailers weighing more than 5 tonnes ( 5.5 short tons ) .
These vehicles had no further development .
Tests and army service showed that T - 26T artillery tractors were underpowered for cross-country towing of trailers weighing more than 5 tonnes ( 5.5 short tons ) , so these vehicles had no further development .