@John *******
There is a covered parking lot with security and CCTV cameras on the Thai side of the order. Prices are reasonable for overnight parking. (200 baht per night) You need to park your car before 8 am and then you can ride the bus or a tuk tuk to the Thai consulate. It is really important to arrive early because there could be a long line at the consulate. You will need a Laos visa for $40 US. Must be clean crisp like new $20 bills. If you use Thai Baht you will get a horrible exchange rate. I think you may need two passport photos for the Laos side of the border for your visa.
You will need to show the following documents at the consulate and you should have copies of all the originals.
1. Original marriage certificate to show them plus a copy to give them.
2. Koro 2 proof of marriage certificate from any Ampur in Thailand. You and your wife will have to apply for this together. This document must be dated less than one week from the day you get it and until you apply for your visa in Laos.
3. Tambian ban (house book) original and one copy.
4. Wife's Thai ID card (original and signed copy).
5. Your passport with more than 6 months validity.
6. You may need to provide photo copies of your passport including all pages with Thai stamps either entering or departing Thailand.