EXCLUSIVE: For a few weeks I've been in contact with a source from a U.S Tesla supplier. They supply certain parts for the S,X,3 and Y, but I'm here to reveal some info on Tesla Semi. As always, take these kinds of things with a grain of salt. Things/timelines can change.
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This supplier starting working on Semi related stuff in Q4 2020 (based on the info I have). Per this supplier, the body will be built in Fremont CA, final assembly will be at Giga Nevada in 2021 & eventually Giga Texas in 2022.
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Whether final assembly will take place both in Nevada and Texas or eventually just switch to Giga Texas when the factory is done is unclear.
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RC builds will start May 2021. Pilot prod will start in July 2021 & the start of prod will be Aug 2021 (for this suppliers parts). Cumulative builds of 350 by Aug 2021.
Volume Projections:
â˘Â 100/week by end of 2021
â˘Â 500/week by end of 2022
â˘Â Sleeper cab by the mid 2021
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Volume Projections:
â˘Â 100/week by end of 2021
â˘Â 500/week by end of 2022
â˘Â Sleeper cab by the mid 2021
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Total builds projection:
2021: 2,500
2022: 10,000
2023: 25,000
2024: 25,000
EU start of production will be by 2023.
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2021: 2,500
2022: 10,000
2023: 25,000
2024: 25,000
EU start of production will be by 2023.
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I know the name of the supplier and their location. I have also seen some spreadsheets and presentations slides from this supplier so I believe the timelines, but as always (and especially with Tesla) things can change so take everything I just said with a grain of salt. 
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I may have additional info to share at a later date :)