Hi new here...need help with removing truck noise from background of old audio tape.

I have old audio tapes that were originally recorded near a road and often there are trucks driving and shifting gears in the background as the voice recordings were made...Adaptive noise reduction reduces this to an occasional low hum maybe around maybe 50-100 hz (?) that occurs in 2-10 second sections around 2-3 times in each 20 minute tape...adaptive noise reduction removes 80% of the truck noise but there is a noticable hum left over this occurs underneath words I haven't been able to remove it. I tried dehummer but it takes out way too much of the vocal lows, sound remover does work either because the truck noise is often to close to the vocal to capture just the truck noise...I attached an audio file...thanks any help would be GREATLY appreciated...take care.