What documents do I need to take my car from Thailand to lao

Can someone help me find where to book bus tickets from Udon Thani to Vientiane?

Or anywhere really from Thailand to any other country.

It's my back up plan in case I don't have other stuff figured out by the time I land in Thailand

I understand you can buy tickets in person for a few $$$ but Im specifically wanting to do this online

hey guys this is another typical tourist visa question. I have to leave the country by the 7th of march, this will be my first visa run. I am planning to go either to Vientiane or Savannakhet to apply for another tourist visa. In terms of cheapest options( Bus + Hotel) which one would it be and is it possible to pay for a Lao visa in Thai baht. Appreciate all the help given. Looking forward to a Tod Daniels or Robert Lagas answer.

Edit - I am based in Bangkok so need to travel from Bangkok

Any visa company that we can go with to Loas ?