I wouldn't overthink a 3-hour trip. Having said that, I've carried way more tools than I've ever needed for many years. I figure they're not only for me, but for stranded strangers if needed, and a few times strangers have appreciated it.
I purchased a set of used tool pouches from Ebay years ago (They're available from storagepouches.com and named 'It's in the bag' I believe). I love these things and they take up virtually no space, fitting in the crevices in the bottom of the bags. It is amazing how many tools etc that these things hold.
So what do I carry? You name it, I probably have it lol. Beside the obvious screwdrivers, torx drivers, sockets, adjustable wrench etc, the items I've found I used the most are plastic zip ties, electrical tape, wind-up flashlight, and beer.
2018 Road Glide Special. 12 inch 'Freedom' shield, Mustang seat, Harley tour pak, Advanblack lowers, Motolights, rear crash bars, Headset plug-in, Ciro footpegs, Black headlamp trim, mesh grill covers, Flash2open garage transmitter, buncha other stuff!!