I use nothing when towing the Jeep.
For our cross-country trip a couple years ago, towing the PT Cruiser on a dolly, I bought a full front cover for the car. It was easy to put on and remove, and I guess it protected the front of the car (all the way over the windshield!), but it was probably a waste of over $400. We will more than likely never use it again, since we don't have the dolly anymore.
I guess I should find it and see if the rodents have chewed it up yet.
CM1, USN (RET)
2017 Jayco TT
Daily Driver: '14 Subaru Outback
1998 Dodge QC LWB, Cummins, 5 speed, 4X2
2 Kawasaki Brute Force 750 ATVs.
Pride Raptor 3 wheeled off-road capable mobility scooter
"When seconds count, help is only minutes away!"