[ScotD]

As noted, each state has it's own regs. In Washington State I'll have to meet headlight beam & height, taillight height & size, horn, etc. - but, as far as I can tell, nothing that impacts weight. And in Florida, as noted, the California Commuter meets the regs. And note that it does have a roll bar, within the bodywork immediately behind the drivers head, though that doesn't appear to be a requirement in Washington State, at least.

Are you sure that New Jersey requires a roll bar? Most of the commercial trikes I've seen are essentially motorcycles with a 3rd wheel - paired either front or back, and I've never seen one of those with a roll bar.