1) Anything can be carried on an unadapted moped. This includes: up to 5 people, huge sheets of plastic, bundles of 15ft bamboo poles, 50 litre gas bottles (full), babies in arms (while driving), dogs, and up to 8 cubic metres of retail goods.
2) Which side of the road you use is a matter for your own discretion.
3) Ditto stopping at red lights. Vientiane has about 6 sets and 2 roundabouts.
4) It is perfectly acceptable to get into a tuktuk, negotiate a fare to where you want to go, and then find yourself on a route involving a short stop at your driver's English speaking mate's house so he can find out where you want to be taken.
5) Coats should be worn backwards on mopeds.
6) If it is bigger than you, it has right of way, except if there is a gap...
7) Pavements are for parking, streets are for walking.
8) Beware open sewers and chickens.