Unfortunately, you’ll have to leave your Envision at home—you cannot tow any version of the 2019 Buick Envision, regardless of the trim or drivetrain. The 2019 Envision is built on a platform that can damage the transmission and drivetrain if you choose to flat tow it**.
Even if you can’t flat tow your Envision, you can still buy a flatbed trailer to take your vehicle wherever you go. It’s just going to cost a bit extra—typically in the $1,000 to $3,000 range. Buying a used one can save you some cash, so that may be a better option.