Towing with Jayco Grayhawk 27DS

We have the same motorhome that you have and have towed a car for almost all of the 50,000 miles we have on the motorhome - - with very few problems. I will agree that there is considerable rear overhang on the rig and with that in mind it's important to have the weight distribution in the rig correct. With much of the storage capacity of the rig in the rear (both inside and out) it's easy to overload the rear axles with too much weight. Have your rig weighed and you will have a better idea if this is part of your problem. I moved over 100 lbs of "stuff" forward of the rear axle and always make sure that there is at least 100 lbs of stuff in the front overhead bunk. Doing that made a very big difference in the way the rig handled and tracked. Once the weight has been redistributed further forward, have the front end aligned (as has been suggested by others). That should help with the tracking as well.