Yours is a common question when ordering new trailers.
The bottom line is that the time of year, what line is being built and availability of delivery drivers will impact the timeliness.
Frankly, you ordered on April 9th and are still way early. Its usually an 8-week wait (give or take a few weeks) and some unfortunate owners who ordered in February are still waiting
Here is a link
to a current discussion about delivery times. Mostly Rockwood Roos, but also other Rockwood models.