I do a lot of vinyl transfers to digital, and one thing you learn very quickly is that on that medium there is no such thing as silence between tracks. Depending on the quality and alignment of a playback turntable, there can be very low frequency content well below 30hz or 20Hz (if you're lucky) that is almost as high a level as the track audio.
If the record is very clean and perfectly flat (virtually pristine), it will usually be a general low level LF waveform of around 10-15Hz to 30Hz, but if it is slightly out of round, or uneven there can be considerable content in the 4-10Hz range. For a full range transfer, those are issues you try to minimize by choice of equipment and a record flattener. However, other choices include various amounts of LF filtering below 20-30Hz. But even then, the 'silent' waveform recorded is far from silent.
In an audio editor (and usually after the fact) You could set up some sort of frequency selective monitoring automatiion with various plugins that only 'hears' the frequencies from say, 50Hz and up, but that doesn't maintain a particularly high fidelity to the LP. It would probably do a decent job if you're not too picky about the results. The automation would manage the fade in/fade out between tracks based on higher frequency signals. Certainly not foolproof, though.
I almost never try to fade out/fade in tracks on a side because it's often quite audible and distracting. But merging side two audio to side one is fairly easily doable, and can be completely 'invisible' to a very minor transition, depending on the technique used. Usually without total fades.
--Bill