Have you inquired to add motorcycle class of vehicles to your current Thai Driver License??

Personally, I think you should just stick to the "KISS" principle: "Keep it Simple, stupid" and just use your USA passport while inside the USA to apply for a Thai Visa with the Thai Embassy or Thai Consulate in America. This will be a Thai e-Visa if inside the USA.

Also, something outside the topics of Thai Visas or Thai Immigration, but if you decide to use your Brazilian Passport, you will find that any potential "advantage" of 90 days Bilateral Visa Exemption (ผ. 90) entry into Thailand, probably do not outweigh the potential several disadvantages that one may encounter, such as: any Brazilian documents in Portuguese have to be translated to English, there isn't a Brazilian Embassy/Consulate in every country across Asia, many other Asian countries require Visas for Brazilian passports (in comparison to USA passports), etc. etc.

it's USD $40.- for all nationalities for a Lao Visa on Arrival, except for China.... oftentimes, if you don't have a photo then add $1 to be USD $41.- make sure the bankrotes, are clean and crisp (new)....

choose the name of the country/territory where it is now called, as the former USSR is now 15 different countries, since unable to choose USSR or fill in custom entry

@Gabe *******

So, in summary, you have a Non-B Visa and Work Permit that both are not yet cancelled, then have a DTV Visa, and, today, made entry into Thailand with the DTV and got an entry stamp for 180 days under your DTV?

in Thailand, the minimum age for Thai citizens to vote is 18 years old, but, for many things, such as the minimum age for Thai citizens to apply for a Thai passport on their own without any signed parental consent is 20 years old.

Before applying for any Thai Visa, specifically ask the Thai Embassy/Thai Consulate if you can apply for a DTV Visa at age 19 years old for yourself before submitting a Thai Visa application to the Thai Embassy/Consulate.

Personally, I think you can apply for any Thai Visa on your own at age 18 years old....

@Terry *******

Yes, price of Lao VoA = $40 since 2022 and for almost all countries (except China) vs. before it could vary depending on the country....

@Declan *********

the official price and still actually paid in real life = USD $40.- for Lao VoA for nearly all nationalities, except China = USD $20.-

@Daniele **********

At the other Friendship Bridges #1 Nong Khai, #2 Mukdahan, #4 Chiang Rai (and should be at #3 Nakhom Phanom), have given USD $100 and received change back in USD and paid $40 Dollars, not 2000 Baht.

But, very sad that you had a bad experience at Friendship Bridge #3 Khammouane for your Lao VoA!

Did you try paying with USD $40 in crisp, clean (new) US Dollar banknotes?? before paying 2000 Baht for the Lao Visa on Arrival (Lao VoA) at Friendship Bridge 3 (Nakhon Phanom)