www.actuonix.com
This dozer uses dual 30mm stroke 50:1 L12-S actuators. Make sure to get the S series, as it takes an esc to operate, giving you infinite height adjustment.
The R series plugs directly into the rx and works exactly like a servo, as in if you put it on a stick ch, when the stick centers so does the actuator at mid travel.
https://youtu.be/5k-rGA7GCZU