yes, you're violating the law by not using a brake controller with the trailer, since it DOES have electric brakes.
as far as i know, all hybrids should have electric brakes unless an owner took them out, which would be against the law.
and a breakaway switch is also required by law.
also sounds like your truck doesn't have the factory tow package, since it would have the 7-pin round connector.
you're going to need to duplicate that package and won't be cheap.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC