He's right about avoiding that border crossing for re-entering Thailand..I simply corrected him about his using the incorrect name for the border, that's all. Everything else he said was correct.
I just don't understand why farangs refer to a Cambodian town as the Thai border, when the immigration offices on both sides of that border work very differently. The Cambodian side, although surly, won't reject you, unless you have a history of overstays, are a political activist or from an "undesirable" nationality such as somewhere in Africa. Westerners will have zero problems entering or exiting Cambodia there BUT the problem lies on re-entering Thailand at Aran, on the Thai side.
Thus choose any other crossing, even nearby Ban Khao Din, which is very easy going.
You can also call it Aran. Also, as a long time Thai resident, it's respectful to use the proper terminology. If I referred to Aran or Khlong Leuk as Poipet, immigration and customs officials there would be quite offended. I've passed through there many times, in recent times mainly leaving Thailand and re-entering through a different border.
It's called Aranyaprathet in Thailand. Avoid giving it the improper name. Poipet is the name of the town on the Cambodian side and there's nothing wrong with their immigration, it's only the Thai side that is the problem and then ONLY when entering, not when exiting Thailand.
Simple, bring your lease and owners ID and house registration or if it's a friend or your Thai wife hosting you, instead of a lease a letter indicating this but again, their signed ID card copy and house registration.
Nearly all countries give you up to 90 days to utilize their visas and in many cases longer. For the DTV, it's valid for 5 years from the date of issue. You get almost 6 months (180 days) on each entry during the visa validity.