One major cause is the possibility that the government may revoke a current rollover exception for convertibles (which is how the Wrangler is technically classed). This would require increased strength for some components. Other safety issues, including relatively new IIHS and NCAP tests and toughened Federal standards, may also come into play.
For a full discussion of the issues and possible solutions, see Mr. Sheaves’ article . Also see our section on the 2018 Jeep Wrangler .