I did a little research about the CMax death wobble while being towed... I gave up!
A couple of weeks ago we traded the Liar for a Jeep Cherokee, joined a forum and found a possible answer.
Here is a link to the electric steering problem when towing a 2014 - (early build) 2016 Cherokee.
Please note that this thread is 56 pages long.
Post #'s 1 to 8 will get you started, # 13 states "According to postings on the Family Motor Home Association website, it happens with different brands of motor homes, different chassis (front gas or diesel pusher), different tow bar systems, different braking systems.
The only constant seems to be that they are towing Jeep Cherokees"
Post #71 pg 8 is where the forum finds out that Jeep is aware and working on the problem.
Post # 87 pg 9 is interesting and more evidence that the elec steering is causing the Cmax problem.
Post #92 pg 10 is where the forum finds out about Jeeps fix.
"A Jeep official said the company knows of several dozen Cherokee owners who have experienced the problem. For those owners, FCA will “provide a complimentary jumper wire harness and switch to ensure the vehicle’s EPS system has power to function while it is being flat-towed. These components have been engineered and validated by FCA US LLC and will be made available to all customers through MOPAR, as early as January 29. In addition, all Cherokee owners will be contacted directly by FCA US and provided with updated instructions for flat-towing. These instructions supersede all previous instructions. Also, the vehicle’s online owners manual will be updated.” "
A quick comment about towing the cmax.
The liar was a great toad, absolutely no problems for 13k towed miles.
MPG not so good, 2 checks and 2 fixes from Ford finally got the MPG to 42/33 notice the 33 highway... once a liar always a liar!
GLAD it's gone, I'm back to beating the EPA... in our 2015 and 2016 cars.