I installed an EcoHitch from Torklift on my Bolt about a year ago, and it has been great. However, I ran across a post on another site where a Tesla Model S owner had an Ecohitch for 3 years, and after getting rear ended, the rear bumper was disassembled and he found out that the hitch and body of the car were corroding badly, due to galvanic corrosion (dissimilar metals touching, causing greatly accelerated corrosion). The Model S has an aluminum body and the hitch is made of steel. In 3 years, there appeared to be holes forming in the aluminum body of the Model S.
Do we need to be concerned about this issue with our hitches? I'm pretty sure the Bolt's unibody is steel, so that shouldn't be an issue, but the "crash bar" behind the bumper cover is made of aluminum (from what I recall), and it's definitely in contact with the steel hitch. I don't recall any sort of spacer between the steel and aluminum, so I'm considering taking everything apart again and making some sort of spacer, maybe out of thick plastic, to keep the two metals apart. Any thoughts/opinions on this?