Yes
That's the safest place to sleep is truck stops.
If you can try to sleep near the trucks. Less likely to be bothered. Just don't take up a space. But no, the employees should not be concerned. If you ask.politely someone like.me should.help.you get a shower in the morning.
Unless there is a law to stop you. I would stay in a rest area. I was sleeping in my car at a Flying J and I just kept having my back window knocked on by people that were begging. I found the rest area was an hour away and I got there.
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