At first he greatly improved its armor and weight so it has a steady grip on the ground. He did of course lose speed, but this isn't too bad. Next to that he removed the big bulk on the back and added a platform with both a Heavy Machine Gun and a Rocket Turret. Finally he added a shovel blade with the text; "EDF GO HOME!" The jetter is also next to indestructible and can be used in Jenkins "side missions" which are located around tharsis
The Vehicle is not seen afterwards, following the Raid on the Badlands Safehouse, until the whole main missions is completed.