I used to lug around a pretty good tool kit on long trips, but I’ve stopped doing that because I never really needed it and it is a lot to carry around. No harm in bringing some sockets, wrenches, pliers, screwdrivers, etc., but I would focus on PM rather than lugging too many tools along. As a practical matter, if something goes wrong with the car that actually forces you to stop, it is unlikely that you will be able to fix it without a good place to work and a lot more tools than you’ll want to bring with you (scan tool, multimeter, jackstands, a good jack, light, shop supplies, fluids, drain pans, extensions, prybar, hammer, penetrant, socket u-joints, etc.)
I just keep up with maintenance, look over the vehicle carefully for damage prior to the trip, fix anything I find that is marginal, and then take the risk I’ll need the services of a shop if something major and unanticipated goes wrong– but I haven’t had that happen yet and I think it is unlikely.