KNN
Chao Turtle tiaggong :
you'll need the side car plans approved by LTA. motorbike shops can direct you to a place that have knowledge on installing sidecars and go on from there...
you must choose either the carriage of passenger or goods (and stick to it).
the bike cannot travel on the highway.
it's cheaper to buy one already attached unless you have a particular side car and bike combo in mind.
Chao Turtle donch know if choon or not.
Bestest consult civil ambassadors at LTA.