I would be asking the people who would be giving you the problems. But, you can't always trust an officer's knowlege, either. I phoned the Ottawa Police Department before I got my moped about highway legality, and was told they were illegal, but the Ontario Government confirmed they were legal on all but the 400 Series. Try the website?
Have you thought of using one of those quality bicycle trailers for children? Actually, a trailer might be a nuisance. I had thought of using one but I made my 7500 mile camping trip with just my moped loaded well with 150 lbs of gear plus my 200 lbs, easy to hide in bushes for free camping, etc. No problem. I had thought of a trailer but didn't want flat tires.