Found this on the net:
Yes, a loud thumping or clunking sound felt under the driver's feet in a Cybertruck is likely the high-voltage (HV) battery contactors engaging or disengaging, which is a normal operating sound. These contactors act as large electrical switches that connect the battery...
Food for thought, according to GROK:
If i buy FSD for my cybertruck, will I also get the unsupervised version when it come out?
Searching the web
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Tesla has not made an official, definitive statement guaranteeing that purchasing Full Self-Driving (FSD, Supervised) outright will...
It is quiet, can be fast with the right foil, takes a lot of balance and is strange while gybing. I do foiling on light wind days with a larger foil. Great fun when it's up on foil.