If you are going slow enough that trucks are passing you, you either have the wrong bike or you are doing it wrong.
I ride a HD 883, which is a tad light for highway riding. I tend to do the speeed limit on a bike so I do get passed alot. Regardless, I just don’t like riding the highway, period, so I limit it to relatively short stretches only. Very conscious that one mistake could put me under the wheels of a car or truck at high speed. Riding the less crowded back roads is more my style.