This is a vehicle that I use for work, it spends about half it's time being towed behind larger vehicles and half it's time driving long distances, 3-400 miles per day in each manner. It has brackets for my towbar welded to the frame in the front as well as an upright guard to protect from impacts with the towing vehicle in the event of a problem with the tow equipment.
None so far.
Install vacuum gauge and other instrumentation to monitor efficiency and health. E3 diamond fire spark plugs. Magnaflow direct attachment catalytic converter, Flowmaster 60 series delta flow muffler. Better tires. Rear spoiler, possibly Bonneville type flat spoiler.