I hate pagers. I carried one everyday all day and night. My life was ruled by one 24/7/365 for over 20 years. First as a volunteer EMT and firefighter then as a full time medic. Just listening and waiting for those tones to drop.
I can still hear them.
The issue is the complexity of the bespoke design of drive trains. It’s nigh on impossible to design a “one size fits all” or even “fits a majority” of solutions for a conversion kit that isn’t stupidly expensive.
See: Edison Motors. A Canadian heavy haul truck manufacturer startup that is trying to offer electric conversions for commercial light and medium duty trucks.