I have a blue and a yellow never been asked for anything ever. I come and go many times in a year. No one asks me. Chiang Mai is where I live. Don't understand why and don't know why others get asked. 16 years I've been here.
What's the rush? Stay in Burma for a couple of days. Interesting and different. Don't hang around the border market area. Move in and stay in the real city. Buy some booze or cigarettes at many shops. Cheap! If you're looking for Viagra go to a pharmacy on the main road. Very cheap and exactly the same as the USA except it comes from India. Never buy from the market area. Fake and deflating.
You take me back 16 years ago doing it on a 100 cc Yamaha. Traffic in those days during the week was almost nonexistent. You could go all the way up to the Chinese border and stay 14 days. Had to check in at many places with a pile of paperwork. Checking your time between checkpoints. LOL. Couldn't take the bike out of Thailand. Secret police followed you in the country towns and cities. Hilarious, they were wearing black leather jackets. People openly smoking opium. It was really amazing. Even Mai Sai was quiet and full of smugglers. I can't find anything like that now. Unfortunately it's all changed. Laos is full of backpackers with loads of mommy and daddy money. Cambodia is tame now. Wow.....How sad. Glad you enjoyed your adventure and thanks for the good info for new people. Excellent advice and true. You would of loved it back then. Don't get me going about Mae Sot. That was my favorite border town for many years. Totally ruined now unfortunately.