We're visiting Jan-Feb 2020 to scout early retirement digs.
I'd planned to retire in Thailand since 1992 but visa requirements have changed and neither my Thai wife nor I want to bother. We'll visit friends & family. Cambo business visa not easy either now.
I though about setting up a building inspection business but returned to reality pretty quick.
Looking at basing out of Da Nang and Nha Trang. We're stopping in HCMC/Saigon first though.
We'll travel out of VN to wherever.
Our plan is to rent hotels and shop housing. Numbeo reports NT as cheaper but either are cheaper than where we want to live in Thailand.