Why are most motorcycle trailers built on two wheels? What happens to a load based on a one wheeled design?

motorcycle camping trailers
by tomspixels

Query by bnmyself: Why are most motorbike trailers constructed on two wheels? What occurs to a load based mostly on a a single wheeled design and style?
Im pondering of creating one particular to pull behind a 150cc scooter to carry camping gear. I assume it would track much better as a one particular wheel layout, similar to the aged vespa and cushman designs. Any assist would be significantly appreciated.

Greatest remedy:

Remedy by jim a
The two wheels are for balance of your load,enabling you much better
control of your bike, as well as the ability to carry much more than if you had a one particular wheel setup.

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