I did my first exit, re-entry with dtv. Just overnight stay in Singapore for the run.
I have dtv e-visa so I printed letter + all my worcation application just in case.
No questions asked but I did show them the printed letter first and said that I had dtv. No other docs were asked no issues.
I had education visa before and did a lot of 1-2 months visits so I got used to be questioned a lot on previous non-dtv visits.
Arrived at Suvarnabhumi.