Have towed my 2015 Rubicon up and down grades up to 8% with our Gemini and although speed dropped below 45 on a long grade I think it was as much to do with losing RPMs from slow traffic as anything. Very pleased with the performance and balance. You will know when you are passed by a semi on the interstate but have yet to feel the vehicle overwhelmed. Been between Flagstaff and Vegas on I-40 and Flagstaff and Phoenix on I-17 both of which are pretty good tests.
Dave and Cinyi
2016 Thor Gemini, Jeep Rubicon.
Prvs:2008 Tiffin AB, 2013 LTV Unity, Airstream 27FB