For a good insight, refer to escapees rv org docs. It is a huge issue for mobile rv folks, full and part time. Their focus is on taxation, vehicle fees, and medical insurance, but it leads to good knowledge which helps with taxation issues.
For us, more than anything, we want to keep the hmo (then their advantage plan) we have had for life, so we need to meet their eligibility requirements. Hopefully the person referenced in the op has checked into their medical coverage!
one thing for sure, when we travel, I make darn sure not to trigger nexus in another state. Some allow 30 days, some, like by, are simply do not work at all, not even an email, within their border. I’m not just personal liability, but same inattentiveness could trigger company liability (even in a no withholding tax state).