UPDATE V1.1
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Conveyor system on tractor has been revised & improved to make loading easier.

The dorsal Connector on the tractor has been replaced with a Collector, meaning the height of the tractor no longer needs to match the height of the loading Connector on your base.

The new Collector is also 1 block further back, meaning both the tractor and trailer Collectors now line up perfectly with large-grid overhead Connectors for loading.

Some minor cosmetics to the undercarriage of the tractor had to change as a result of the improvement, though the changes are well hidden & hard to see.
Also some minor changes to the conveyor network on the tractor were needed. This should help make the tractor more compatible with the small-grid Hydrogen Engine when it's released in the coming Survival update.

Hope you like the changes. Please let me know your thoughts in the comments!