You are correct, you are were not clear you wanted to be a node in a virtual power plant.
This, however, is regulated by your specific power company. I don't know about FL, but here in CA I'm prohibited from selling power back to the grid from my powerwalls (I can only do it on solar). Here at least, they do monitor and know if I export back in the evenings.
It's stupid, doesn't make sense, but it is regulated, so just make sure you follow the regulations for your power company.
Basically, you want to "rate arbitrage" with the pack on the truk. That's fine, but it's not as simple as having the freedom to "do what you want". You may own the truk, but they own the grid and determine the rules for it's usage.