A fifth wheel is a type of coupling device used for towing campers, trailers and various types of recreational vehicles.  More broadly, the term “fifth wheeler” refers to recreational vehicles.  In the category of “bringing another vehicle with you”, I saw one of the stranger entries while walking down Soi Thong Lor 13 on my way home from the market last Friday:

What in the world is this guy doing and why?  I have one particular answer in mind, but I want to see what you think the answer might be.