Traveling Tanks

[nerdymermaid121]

Hi all! I have scoured the forum a bit, and I could not find anything specific for this topic. I want to eventually have a traveling mermaid tank that I can bring to events around town (Earth Day events, World Oceans Day, renaissance faires, etc...). I know they're not cheap. There is a local polymer tank manufacturer here in my town that I figure I'll custom order from eventually. My question is more in regards to the size that anyone that might have/use a tank would recommend. Keeping in mind that it'll still need to be mobile (most likely on a small trailer that could have a facade added to it to hide the trailer or something), what size do you suggest that gives enough room to show off the fins while also being able to dive down to pick up treasures for the visitors?

Thanks in advance!!