I saw one post on here about someone in Phuket getting 60 day as they had a new passport and the DTV was on the old one. Not heard of any other examples
Does not matter which visa it is the same. You need a Residence Certificate and the details should state it is specifically for that reason ie vehicle transfer. The seller will give you the Green Book and Bill of Sale. Take copies of your passport and the documents above to the Department of Land Transport along with the vehicle. It is completed there and I think the cost is circa 500 THB (you can scan the money but it costs 10 THB cash too for some reason). I just registered a bike last week and I am pretty certain that is all that was needed - it worked anyway. There are usually agents close to DLT offices that will do it for you for a few hundred Baht. It does smooth the process. As with anything in Thailand how easy the process is often depends on which particular office you attend. My friend has a pretty large garage selling mostly cars and some bikes. There are certain DLT's she avoids.
Anonymous participant 799 I have seen 2 about the Laos crossing. One agent posted Monday same day from Chiang Mai fine on DTV - by that afternoon sending emails saying 2500 fee for same day on top of transport. A Bangkok Visa Run company said they do not do any same day now also. I think it is 1) They are seeing money making opportinity 2) Demand for border runs are way down as the visa exempt guys cannot go and if applying for Tourist Visa need to go where there is a consulate or embassy. From Chiang Mai and need a TR you need to fly in reality.
The only effect I have seen is some borders and agents trying to take advantage and charging for same-day return - this has been reported at 2 Laos land border points. Probably cheaper to fly somewhere.