In my old truck, no problem I could see the hitch. New truck bed box sits up higher. Bought these,
https://www.harborfreight.com/magnet...kit-69778.html
They work great. I just line them up in the rear view mirror. I do use one of those long handled grabbers to take them off. I put one centered on the king pin and the other one the front part of the hitch plate.