As others have said, Trump has HR professionals who deal with the purchase of health care in multiple states.
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To be honest - I am sick of so called limited govt conservatives who have hypocritically worked for the govt their whole lives. Even in his private practice Cruz dealt exclusively with govt issues. As an employee. Neither Cruz nor Rubio as life long govt employees and as lawyers have never run a large complicated business or had to deal with payroll on a weekly basis and with human resource issues.
Just because Cruz and Rubio are correct on the issues does not mean they are competent executives. That is what the presidency is - an executive leadership position. Their resume is piss poor compared to Trumps.